Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Language: Old French
Origin: rubis, rubi, from Latin rubeus 'reddish'

ruby

 noun
     
Related topics: Colours, Jewellery
ru‧by plural rubies
1 [countable]DCJ a red jewel
2 also ruby red [uncountable]CC a dark red colour
—ruby adjective
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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