[ roo-bee ]
/ ˈru bi /

noun, plural ru·bies.


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

Nearby words

  1. rubricyte,
  2. rubrospinal decussation,
  3. rubrum lily,
  4. rubstone,
  5. rubtsovsk,
  6. ruby glass,
  7. ruby laser,
  8. ruby silver,
  9. ruby spinel,
  10. ruby-crowned kinglet

Origin of ruby

1275–1325; Middle English rubi (noun) from Old French, from Old Provençal robi(n), from Medieval Latin rubīnus (lapis) “red (stone),” derivative of Latin ruber, rubeus red1

Related formsru·by·like, adjective


[ roo-bee ]
/ ˈru bi /


a female given name. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples 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 Formsruby-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

Word Origin and History for ruby



"clear rich-red variety of corundum," c.1300, from Old French rubi (12c.), from Medieval Latin rubinus lapis "red stone" (cf. Italian rubino), from Latin rubeus "red," related to ruber (see red). As a color name from 1570s. As an adjective from late 15c. Modern French rubis is not explained; Klein suggests a plural mistaken for singular.

Online Etymology Dictionary, © 2010 Douglas Harper

Science 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.