noun, plural rubies.
1. a red variety of corundum, used as a gem.
2. something made of this stone or one of its imitations, as a bearing in a watch.
3. a deep-red port wine.
4. deep red; carmine.
5. British Printing. a 5½-point type, nearly corresponding in size to American agate.
6. ruby-colored: ruby lips.
7. containing or set or adorned with a ruby or rubies: a ruby necklace.
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Origin: 1275-1325; Middle English rubi (noun) < Old French < Old Provençal robi (n) < Medieval Latin rubīnus (lapis) red (stone), derivative of Latin ruber red
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