greyhound Meaning, Definition & Usage

  1. noun a tall slender dog of an ancient breed noted for swiftness and keen sight; used as a racing dog

WordNet

Grey"hound` noun
Etymology
OE. graihund, greihound, greahund, grihond, Icel. greyhundr; grey greyhound + hundr dog; cf. AS. gr?ghund. The origin of the first syllable is unknown.
Definitions
  1. A slender, graceful breed of dogs, remarkable for keen sight and swiftness. It is one of the oldest varieties known, and is figured on the Egyptian monuments. Written also grayhound.

Webster 1913