[ 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.

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


ru·by·like, adjective

Definition for ruby (2 of 2)

[ roo-bee ]
/ ˈru bi /


a female given name. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

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 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.