blood·hound (bl?d?hound?)n.1. A hound of a breed having a smooth coat, drooping ears, loose skin especially around the jowls, and a keen sense of smell.2. Informal A relentless pursuer.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.bloodhound (?bl?d?ha?nd) n1. (Breeds) 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 work2. informal a detectiveCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014blood?hound (?bl?d?ha?nd) n. 1. one of a breed of large dogs with very long ears, loose skin, a usu. black-and-tan coat, and an acute sense of smell. 2. a person who is a steadfast pursuer. [1300?50] Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.