Definition of ruby noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//ˈruːbi//
    ; NAmE NAmE//ˈruːbi//
    (pl. rubies)
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  1. 1 [countable, uncountable] a dark red precious stone a ruby ring
  2. 2 [uncountable] a dark red colour
  3. Word OriginMiddle English: from Old French rubi, from medieval Latin rubinus, from the base of Latin rubeus ‘red’.

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