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The Collaborative International Dictionary of English v.0.48 (gcide)

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.
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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
edifice.
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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
included.
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Syn: Honorable; worthy; dignified; elevated; exalted;
superior; sublime; great; eminent; illustrious;
renowned; stately; splendid; magnificent; grand;
magnanimous; generous; liberal; free.
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Xenon \Xen"on\ (z[e^]n"[o^]n; z[=e]"n[o^]n), n. [Gr. xe`non,
neut. of xe`nos strange.] (Chem.)
A very heavy, inert gaseous element of the noble gas group,
occurring in the atmosphere in the proportion of one volume
is about 20 millions. It was discovered by Ramsay and Travers
in 1898. It can be condensed to a liquid boiling at -107[deg]
C., and to a solid which melts at -111.9[deg] C. Symbol Xe
(formerly also X); atomic number 54; atomic weight 131.3.
[Webster 1913 Suppl. PJC]