Dictionary.com
Thesaurus.com

nursehound

British  
/ ˈnɜːsˌhaʊnd /

noun

  1. a species of European dogfish, Scyliorrhinus caniculus

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of nursehound

C20: nurse ( shark ) + hound 1