1) Borzoi 1) Formerly used to hunt wolves 2) Hound 3) Hound dog 4) Irish canine 5) Popular dog breed 6) The largest breed of dogs 
[horse] Wolfhound is a thoroughbred racehorse. He won the Haydock Sprint Cup and the Prix de la Forêt. ...
• (n.) Originally, a large hound used in hunting wolves; now, any one of certain breeds of large dogs, some of which are nearly identical with the great Danes.
Wolf'hound` noun (Zoology) Originally, a large hound used in hunting wolves; now, any one of certain breeds of large dogs, some of which are nearly identical with the great Danes. 
HMS Wolfhound was a British W Class destroyer of 1100 tons displacement launched in 1918. She was armed with four 4-inch guns; two 2-pounder pompom anti-aircraft guns; one machine gun; four Lewis guns and six 21-inch torpedo tubes arranged in two triple mountings. She was powered by three Yarrow oil boilers providing a top speed of 34 knots and car...
[n] - the largest breed of dogs
Series of 6x6 armoured cars, Chevrolet, 1944 [US]
noun the largest breed of dogs; formerly used to hunt wolves