cylindrical vault


From The Collaborative International Dictionary of English v.0.48:

Vault \Vault\ (v[add]lt; see Note, below), n. [OE. voute, OF.
   voute, volte, F. vo[^u]te, LL. volta, for voluta, volutio,
   fr. L. volvere, volutum, to roll, to turn about. See
   Voluble, and cf. Vault a leap, Volt a turn, Volute.]
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   1. (Arch.) An arched structure of masonry, forming a ceiling
      or canopy.
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            The long-drawn aisle and fretted vault. --Gray.
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   2. An arched apartment; especially, a subterranean room, used
      for storing articles, for a prison, for interment, or the
      like; a cell; a cellar. "Charnel vaults." --Milton.
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            The silent vaults of death.           --Sandys.
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            To banish rats that haunt our vault.  --Swift.
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   3. The canopy of heaven; the sky.
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            That heaven's vault should crack.     --Shak.
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   4. [F. volte, It. volta, originally, a turn, and the same
      word as volta an arch. See the Etymology above.] A leap or
      bound. Specifically:
      (a) (Man.) The bound or leap of a horse; a curvet.
      (b) A leap by aid of the hands, or of a pole, springboard,
          or the like.
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   Note: The l in this word was formerly often suppressed in
         pronunciation.
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   Barrel vault, Cradle vault, Cylindrical vault, or
   Wagon vault (Arch.), a kind of vault having two parallel
      abutments, and the same section or profile at all points.
      It may be rampant, as over a staircase (see {Rampant
      vault}, under Rampant), or curved in plan, as around the
      apse of a church.

   Coved vault. (Arch.) See under 1st Cove, v. t.

   Groined vault (Arch.), a vault having groins, that is, one
      in which different cylindrical surfaces intersect one
      another, as distinguished from a barrel, or wagon, vault.
      

   Rampant vault. (Arch.) See under Rampant.

   Ribbed vault (Arch.), a vault differing from others in
      having solid ribs which bear the weight of the vaulted
      surface. True Gothic vaults are of this character.

   Vault light, a partly glazed plate inserted in a pavement
      or ceiling to admit light to a vault below.
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.

From The Collaborative International Dictionary of English v.0.48:

Cylindric \Cy*lin"dric\ (s?-l?n"dr?k), Cylindrical
\Cy*lin"dric*al\ (-dr?-kal), a. [Gr. kylindriko`s, from
   ky`lindros cylinder: cf. F. cylindrique.]
   Having the form of a cylinder, or of a section of its convex
   surface; partaking of the properties of the cylinder.
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   Cylindrical lens, a lens having one, or more than one,
      cylindrical surface.

   Cylindric surface or Cylindrical surface, (Geom.), a
      surface described by a straight line that moves according
      to any law, but so as to be constantly parallel to a given
      line.

   Cylindrical vault. (Arch.) See under Vault, n.
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