From The Collaborative International Dictionary of English v.0.48:

Noble \No"ble\, a. [Compar. Nobler; superl. Noblest.] [F.
   noble, fr. L. nobilis that can be or is known, well known,
   famous, highborn, noble, fr. noscere to know. See know.]
   1. Possessing eminence, elevation, dignity, etc.; above
      whatever is low, mean, degrading, or dishonorable;
      magnanimous; as, a noble nature or action; a noble heart.
      [1913 Webster]

            Statues, with winding ivy crowned, belong
            To nobler poets for a nobler song.    --Dryden.
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   2. Grand; stately; magnificent; splendid; as, a noble
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   3. Of exalted rank; of or pertaining to the nobility;
      distinguished from the masses by birth, station, or title;
      highborn; as, noble blood; a noble personage.
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   Note: Noble is used in the formation of self-explaining
         compounds; as, noble-born, noble-hearted, noble-minded.
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   Noble gas (Chem.), a gaseous element belonging to group
      VIII of the periodic table of elements, not combining with
      other elements under normal reaction conditions;
      specifically, helium, neon, argon, krypton,
      xenon, or radon; also called inert gas.

   Noble metals (Chem.), silver, gold, and platinum; -- so
      called from their resistance to oxidation by air and to
      dissolution by acids. Copper, mercury, aluminium,
      palladium, rhodium, iridium, and osmium are sometimes
      [1913 Webster]

   Syn: Honorable; worthy; dignified; elevated; exalted;
        superior; sublime; great; eminent; illustrious;
        renowned; stately; splendid; magnificent; grand;
        magnanimous; generous; liberal; free.
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48:

Radon \Ra"don\ (r[=a]"d[o^]n), n. (Chem.)
   An intensely radioactive gaseous element produced by the
   radioactive decay of radium-226, which is the main isotope of
   radium found in pitchblende. Chemically it is an inert noble
   gas. Its atomic symbol is Rn. It has an atomic number of 86.
   The radon isotope produced by decay of radium has an atomic
   weight of 222.017, and this isotope decays by alpha emission
   with a half-life of 3.82 days. Numerous other isotopes have
   been observed, all radioactive and all having half-lives
   shorter than that of radon-222. Radon was discovered by M.
   and Mme. Curie, of Paris, in their studies of the radioactive
   substances in pitchblende. Radon was originally called
   radium emanation or exradio.
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