one of a breed of tall, slender, short-haired dogs, noted for its keen sight and swiftness.
a swift ship, especially a fast ocean liner.
Also, grayhound.

before 1000; Middle English greihund, grehund, grihund, Old English grīghund < Old Norse greyhundr; compare Old Norse grey bitch; see hound1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
greyhound (ˈɡreɪˌhaʊnd)
a tall slender fast-moving dog of an ancient breed originally used for coursing

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

O.E. grighund, from grig- "bitch" + hund "dog" (see hound). The name has nothing to do with color, and most are not gray. The O.N. form of the word is preserved in Hjalti's couplet that almost sparked war between pagans and Christians in early Iceland:
Vilkat goð geyja
grey þykkjumk Freyja

"I will not blaspheme the gods,
but I think Freyja is a bitch"
Online Etymology Dictionary, © 2010 Douglas Harper
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Bible Dictionary

Greyhound definition

(Prov. 30:31), the rendering of the Hebrew _zarzir mothnayim_, meaning literally "girded as to the lions." Some (Gesen.; R.V. marg.) render it "war-horse." The LXX. and Vulgate versions render it "cock." It has been by some interpreters rendered also "stag" and "warrior," as being girded about or panoplied, and "wrestler." The greyhound, however, was evidently known in ancient times, as appears from Egyptian monuments.

Easton's 1897 Bible Dictionary
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Example sentences
He's a rescue from a greyhound racing track that closed in our area last year.
Palfrey would fit right in at a greyhound track, with his swept-back hair and confidence-winning eyes.
Sports such as football and greyhound racing have been gaining a few lengths on
  the nags.
The only comparable increase in animals is found in a greyhound, racehorse, or
  wolf running at full speed.
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