Real Dictionary

bloodhound
countable noun: A bloodhound is a large dog with a very good sense of smell. Bloodhounds are often used to find people or other animals by following their scent.

bloodhound in American English
any of a breed of large dogs with a smooth coat, wrinkled face, drooping ears, and a keen sense of smell
noun: one of a breed of medium- to large-sized dogs, usually having a black-and-tan coat, very long ears, loose skin, and an acute sense of smell: used chiefly for following human scents

bloodhound in British English
noun: a large breed of hound having a smooth glossy coat of red, tan, or black and loose wrinkled skin on its head: formerly much used in tracking and police work