From The Collaborative International Dictionary of English v.0.48 [gcide]:
Ruby \Ru"by\, n.; pl. {Rubies}. [F. rubis (cf. Pr. robi), LL.
rubinus, robinus, fr. L. rubeus red, reddish, akin to ruber.
See {Rouge}, {red}.]
1. (Min.) A precious stone of a carmine red color, sometimes
verging to violet, or intermediate between carmine and
hyacinth red. It is a red crystallized variety of
corundum.
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Note: Besides the true or Oriental ruby above defined, there
are the balas ruby, or ruby spinel, a red variety of
spinel, and the rock ruby, a red variety of garnet.
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Of rubies, sapphires, and pearles white.
--Chaucer.
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2. The color of a ruby; carmine red; a red tint.
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The natural ruby of your cheeks. --Shak.
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3. That which has the color of the ruby, as red wine. Hence,
a red blain or carbuncle.
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4. (Print.) See {Agate}, n., 2. [Eng.]
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5. (Zool.) Any species of South American humming birds of the
genus {Clytolaema}. The males have a ruby-colored throat
or breast.
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{Ruby of arsenic}, {Ruby of sulphur} (Chem.), a glassy
substance of a red color and a variable composition, but
always consisting chiefly of the disulphide of arsenic; --
called also {ruby sulphur}.
{Ruby of zinc} (Min.), zinc sulphide; the mineral zinc blende
or sphalerite.
{Ruby silver} (Min.), red silver. See under {Red}.
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From The Collaborative International Dictionary of English v.0.48 [gcide]:
Ruby \Ru"by\, a.
Ruby-colored; red; as, ruby lips.
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From The Collaborative International Dictionary of English v.0.48 [gcide]:
Ruby \Ru"by\, v. t. [imp. & p. p. {Rubied}; p. pr. & vb. n.
{Rubying}.]
To make red; to redden. [R.] --Pope.
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From WordNet (r) 3.0 (2006) [wn]:
ruby
adj 1: of a color at the end of the color spectrum (next to
orange); resembling the color of blood or cherries or
tomatoes or rubies [syn: {red}, {reddish}, {ruddy},
{blood-red}, {carmine}, {cerise}, {cherry}, {cherry-red},
{crimson}, {ruby}, {ruby-red}, {scarlet}]
n 1: a transparent piece of ruby that has been cut and polished
and is valued as a precious gem
2: a transparent deep red variety of corundum; used as a
gemstone and in lasers
3: a deep and vivid red color [syn: {crimson}, {ruby}, {deep
red}]
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