From The Collaborative International Dictionary of English v.0.48:

Lead \Lead\ (l[e^]d), n. [OE. led, leed, lead, AS. le['a]d; akin
   to D. lood, MHG. l[=o]t, G. loth plummet, sounding lead,
   small weight, Sw. & Dan. lod. [root]123.]
   1. (Chem.) One of the elements, a heavy, pliable, inelastic
      metal, having a bright, bluish color, but easily
      tarnished. It is both malleable and ductile, though with
      little tenacity, and is used for tubes, sheets, bullets,
      etc. Its specific gravity is 11.37. It is easily fusible
      (melting point 327.5[deg] C), forms alloys with other
      metals, and is an ingredient of solder and type metal.
      Atomic number 82. Atomic weight, 207.2. Symbol Pb (L.
      Plumbum). It is chiefly obtained from the mineral galena,
      lead sulphide.
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   2. An article made of lead or an alloy of lead; as:
      (a) A plummet or mass of lead, used in sounding at sea.
      (b) (Print.) A thin strip of type metal, used to separate
          lines of type in printing.
      (c) Sheets or plates of lead used as a covering for roofs;
          hence, pl., a roof covered with lead sheets or terne
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                I would have the tower two stories, and goodly
                leads upon the top.               --Bacon
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   3. A small cylinder of black lead or graphite, used in
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   Black lead, graphite or plumbago; -- so called from its
      leadlike appearance and streak. [Colloq.]

   Coasting lead, a sounding lead intermediate in weight
      between a hand lead and deep-sea lead.

   Deep-sea lead, the heaviest of sounding leads, used in
      water exceeding a hundred fathoms in depth. --Ham. Nav.

   Hand lead, a small lead use for sounding in shallow water.

   Krems lead, Kremnitz lead [so called from Krems or
      Kremnitz, in Austria], a pure variety of white lead,
      formed into tablets, and called also Krems white, or
      Kremnitz white, and Vienna white.

   Lead arming, tallow put in the hollow of a sounding lead.
      See To arm the lead (below).

   Lead colic. See under Colic.

   Lead color, a deep bluish gray color, like tarnished lead.

   Lead glance. (Min.) Same as Galena.

   Lead line
      (a) (Med.) A dark line along the gums produced by a
          deposit of metallic lead, due to lead poisoning.
      (b) (Naut.) A sounding line.

   Lead mill, a leaden polishing wheel, used by lapidaries.

   Lead ocher (Min.), a massive sulphur-yellow oxide of lead.
      Same as Massicot.

   Lead pencil, a pencil of which the marking material is
      graphite (black lead).

   Lead plant (Bot.), a low leguminous plant, genus Amorpha
      (Amorpha canescens), found in the Northwestern United
      States, where its presence is supposed to indicate lead
      ore. --Gray.

   Lead tree.
      (a) (Bot.) A West Indian name for the tropical, leguminous
          tree, Leuc[ae]na glauca; -- probably so called from
          the glaucous color of the foliage.
      (b) (Chem.) Lead crystallized in arborescent forms from a
          solution of some lead salt, as by suspending a strip
          of zinc in lead acetate.

   Mock lead, a miner's term for blende.

   Red lead, a scarlet, crystalline, granular powder,
      consisting of minium when pure, but commonly containing
      several of the oxides of lead. It is used as a paint or
      cement and also as an ingredient of flint glass.

   Red lead ore (Min.), crocoite.

   Sugar of lead, acetate of lead.

   To arm the lead, to fill the hollow in the bottom of a
      sounding lead with tallow in order to discover the nature
      of the bottom by the substances adhering. --Ham. Nav.

   To cast the lead, or To heave the lead, to cast the
      sounding lead for ascertaining the depth of water.

   White lead, hydrated carbonate of lead, obtained as a
      white, amorphous powder, and much used as an ingredient of
      white paint.
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From The Collaborative International Dictionary of English v.0.48:

Lead \Lead\ (l[=e]d), v. t. [imp. & p. p. Led (l[e^]d); p. pr.
   & vb. n. Leading.] [OE. leden, AS. l[=ae]dan (akin to OS.
   l[=e]dian, D. leiden, G. leiten, Icel. le[imac][eth]a, Sw.
   leda, Dan. lede), properly a causative fr. AS. li[eth]an to
   go; akin to OHG. l[imac]dan, Icel. l[imac][eth]a, Goth.
   lei[thorn]an (in comp.). Cf. Lode, Loath.]
   1. To guide or conduct with the hand, or by means of some
      physical contact or connection; as, a father leads a
      child; a jockey leads a horse with a halter; a dog leads a
      blind man.
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            If a blind man lead a blind man, both fall down in
            the ditch.                            --Wyclif
                                                  (Matt. xv.
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            They thrust him out of the city, and led him unto
            the brow of the hill.                 --Luke iv. 29.
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            In thy right hand lead with thee
            The mountain nymph, sweet Liberty.    --Milton.
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   2. To guide or conduct in a certain course, or to a certain
      place or end, by making the way known; to show the way,
      esp. by going with or going in advance of. Hence,
      figuratively: To direct; to counsel; to instruct; as, to
      lead a traveler; to lead a pupil.
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            The Lord went before them by day in a pillar of a
            cloud, to lead them the way.          --Ex. xiii.
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            He leadeth me beside the still waters. --Ps. xxiii.
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            This thought might lead me through the world's vain
            Content, though blind, had I no better guide.
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   3. To conduct or direct with authority; to have direction or
      charge of; as, to lead an army, an exploring party, or a
      search; to lead a political party.
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            Christ took not upon him flesh and blood that he
            might conquer and rule nations, lead armies, or
            possess places.                       --South.
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   4. To go or to be in advance of; to precede; hence, to be
      foremost or chief among; as, the big sloop led the fleet
      of yachts; the Guards led the attack; Demosthenes leads
      the orators of all ages.
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            As Hesperus, that leads the sun his way. --Fairfax.
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            And lo ! Ben Adhem's name led all the rest. --Leigh
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   5. To draw or direct by influence, whether good or bad; to
      prevail on; to induce; to entice; to allure; as, to lead
      one to espouse a righteous cause.
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            He was driven by the necessities of the times, more
            than led by his own disposition, to any rigor of
            actions.                              --Eikon
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            Silly women, laden with sins, led away by divers
            lusts.                                --2 Tim. iii.
                                                  6 (Rev. Ver.).
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   6. To guide or conduct one's self in, through, or along (a
      certain course); hence, to proceed in the way of; to
      follow the path or course of; to pass; to spend. Also, to
      cause (one) to proceed or follow in (a certain course).
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            That we may lead a quiet and peaceable life. --1
                                                  Tim. ii. 2.
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            Nor thou with shadowed hint confuse
            A life that leads melodious days.     --Tennyson.
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            You remember . . . the life he used to lead his wife
            and daughter.                         --Dickens.
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   7. (Cards & Dominoes) To begin a game, round, or trick, with;
      as, to lead trumps; the double five was led.
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   To lead astray, to guide in a wrong way, or into error; to
      seduce from truth or rectitude.

   To lead captive, to carry or bring into captivity.

   To lead the way, to show the way by going in front; to act
      as guide. --Goldsmith.
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From The Collaborative International Dictionary of English v.0.48:

Lead \Lead\ (l[e^]d), v. t. [imp. & p. p. Leaded; p. pr. & vb.
   n. Leading.]
   1. To cover, fill, or affect with lead; as, continuous firing
      leads the grooves of a rifle.
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   2. (Print.) To place leads between the lines of; as, to lead
      a page; leaded matter.
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From The Collaborative International Dictionary of English v.0.48:

Lead \Lead\, v. i.
   1. To guide or conduct, as by accompanying, going before,
      showing, influencing, directing with authority, etc.; to
      have precedence or pre["e]minence; to be first or chief;
      -- used in most of the senses of lead, v. t.
      [1913 Webster]

   2. To tend or reach in a certain direction, or to a certain
      place; as, the path leads to the mill; gambling leads to
      other vices.
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            The mountain foot that leads towards Mantua. --Shak.
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   To lead off or To lead out, to go first; to begin; as,
      Mickey Mantle led off in the fifth inning of the game.
      [1913 Webster +PJC]

From The Collaborative International Dictionary of English v.0.48:

Lead \Lead\, n.
   1. The act of leading or conducting; guidance; direction; as,
      to take the lead; to be under the lead of another.
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            At the time I speak of, and having a momentary lead,
            . . . I am sure I did my country important service.
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   2. Precedence; advance position; also, the measure of
      precedence; as, the white horse had the lead; a lead of a
      boat's length, or of half a second.
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   3. (Cards & Dominoes) The act or right of playing first in a
      game or round; the card suit, or piece, so played; as,
      your partner has the lead.
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   4. An open way in an ice field. --Kane.
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   5. (Mining) A lode.
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   6. (Naut.) The course of a rope from end to end.
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   7. (Steam Engine) The width of port opening which is
      uncovered by the valve, for the admission or release of
      steam, at the instant when the piston is at end of its
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   Note: When used alone it means outside lead, or lead for the
         admission of steam. Inside lead refers to the release
         or exhaust.
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   8. (Civil Engineering) the distance of haul, as from a
      cutting to an embankment.
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   9. (Horology) The action of a tooth, as a tooth of a wheel,
      in impelling another tooth or a pallet. --Saunier.
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   10. (Music.)
       (a) The announcement by one voice part of a theme to be
           repeated by the other parts.
       (b) A mark or a short passage in one voice part, as of a
           canon, serving as a cue for the entrance of others.
           [Webster 1913 Suppl.]

   11. In an internal-combustion engine, the distance, measured
       in actual length of piston stroke or the corresponding
       angular displacement of the crank, of the piston from the
       end of the compression stroke when ignition takes place;
       -- called in full

   lead of the ignition. When ignition takes place during the
      working stroke the corresponding distance from the
      commencement of the stroke is called

   negative lead.
      [Webster 1913 Suppl.]

   12. (Mach.) The excess above a right angle in the angle
       between two consecutive cranks, as of a compound engine,
       on the same shaft.
       [Webster 1913 Suppl.]

   13. (Mach.) In spiral screw threads, worm wheels, or the
       like, the amount of advance of any point in the spiral
       for a complete turn.
       [Webster 1913 Suppl.]

   14. (Elec.)
       (a) The angle between the line joining the brushes of a
           continuous-current dynamo and the diameter
           symmetrical between the poles.
       (b) The advance of the current phase in an alternating
           circuit beyond that of the electromotive force
           producing it.
           [Webster 1913 Suppl.]

   15. (Theat.) A role for a leading man or leading woman; also,
       one who plays such a role.
       [Webster 1913 Suppl.]

   16. The first story in a newspaper or broadcast news program.

   17. an electrical conductor, typically as an insulated wire
       or cable, connecting an electrical device to another
       device or to a power source, such as a conductor
       conveying electricity from a dynamo.

   18. (Baseball) the distance a runner on base advances from
       one base toward the next before the pitch; as, the long
       lead he usually takes tends to distract the pitchers.

   Lead angle (Steam Engine), the angle which the crank maker
      with the line of centers, in approaching it, at the
      instant when the valve opens to admit steam.

   Lead screw (Mach.), the main longitudinal screw of a lathe,
      which gives the feed motion to the carriage.
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