Etymology
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ruby (n.)

valuable precious gem, in modern understanding a clear, rich-red variety of corundum, c. 1300, rubi, rubie (late 12c. as a surname), from Old French rubi (12c.), from Medieval Latin rubinus lapis "red stone" (source also of Italian rubino), from Latin rubeus "red," which is related to ruber (from PIE root *reudh- "red, ruddy").

As a name for a pure or somewhat crimson-red color, from 1570s. As an adjective from late 15c., "made from or with rubies;" c. 1500 as "of a ruby color." Modern French rubis is not explained; Klein suggests a plural mistaken for singular.

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Definitions of ruby
1
ruby (n.)
a transparent piece of ruby that has been cut and polished and is valued as a precious gem;
ruby (n.)
a transparent deep red variety of corundum; used as a gemstone and in lasers;
ruby (n.)
a deep and vivid red color;
Synonyms: crimson / deep red
2
ruby (adj.)
of a color at the end of the color spectrum (next to orange); resembling the color of blood or cherries or tomatoes or rubies;
Synonyms: red / reddish / ruddy / blood-red / carmine / cerise / cherry / cherry-red / crimson / ruby-red / scarlet
From wordnet.princeton.edu