[ roo-bee ]
/ ˈru bi /
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noun, plural ru·bies.


ruby-colored: ruby lips.
containing or set or adorned with a ruby or rubies: a ruby necklace.



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“Was” is used for the indicative past tense of “to be,” and “were” is only used for the subjunctive past tense.

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Origin of ruby

First recorded in 1300–50; Middle English noun rubi from Old French, from Old Provençal robi(n) , from Medieval Latin rubīnus (lapis) “red (stone),” derivative of Latin ruber, rubeus red1


ru·by·like, adjective

Definition for ruby (2 of 2)

[ roo-bee ]
/ ˈru bi /


a female given name.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

Example sentences from the Web for ruby

British Dictionary definitions for ruby

/ (ˈruːbɪ) /

noun plural -bies

a deep red transparent precious variety of corundum: occurs naturally in Myanmar and Sri Lanka but is also synthesized. It is used as a gemstone, in lasers, and for bearings and rollers in watchmaking. Formula: Al 2 O 3
  1. the deep-red colour of a ruby
  2. (as adjective)ruby lips
  1. something resembling, made of, or containing a ruby
  2. (as modifier)ruby necklace
(modifier) denoting a fortieth anniversaryour ruby wedding
(formerly) a size of printer's type approximately equal to 5 1/2 point

Derived forms of ruby

ruby-like, adjective

Word Origin for ruby

C14: from Old French rubi, from Latin rubeus reddish, from ruber red
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for ruby

[ rōōbē ]

A deep-red, translucent variety of the mineral corundum, containing small amounts of chromium and valued as a gem. Compare sapphire.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.