whippet Syllabification: (whip·pet)Pronunciation: /ˈ(h)wipit/Definition of whippet noun a dog of a small slender breed originally produced as a cross between the greyhound and the terrier or spaniel, bred for racing. Origin: early 17th century: partly from obsolete whippet 'move briskly'whippet in other Oxford dictionaries Definition of whippet in the British & World English dictionary