A greyhound is a dog with a thin body and long thin legs, which can run very fast. Greyhounds sometimes run in races and people bet on them.
greyhound in British English
(ˈɡreɪˌhaʊnd)
noun
a tall slender fast-moving dog of an ancient breed originally used for coursing
Word origin
Old English grīghund, related to Old Norse greyhundr, from grey bitch, hundr dog
greyhound in American English
(ˈgreɪˌhaʊnd)
noun
any of a breed of tall, slender, swift dog with a long, narrow head and a short, smooth coat, formerly much used in coursing and now very popular as a racing dog
Word origin
ME grehounde < OE grighund, *grieghund, akin to ON greyhundr < *grieg, bitch, coward (prob. < IE *gherēu- < base *ĝher-, to shine > gray1) + hund, dog, hound1