World English Dictionary
ruby (ˈruːbɪ)
n , pl -bies
1.  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: Al2O3
2.  a.  the deep-red colour of a ruby
 b.  (as adjective): ruby lips
3.  a.  something resembling, made of, or containing a ruby
 b.  (as modifier): ruby necklace
4.  (modifier) denoting a fortieth anniversary: our ruby wedding
5.  (formerly) a size of printer's type approximately equal to 5½ point
[C14: from Old French rubi, from Latin rubeus reddish, from ruber red]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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