Dictionary.com
definitions

hooded seal

noun
  1. a large seal, Cystophora cristata, the male of which has a large, distensible, hoodlike sac on the head.

Origin of hooded seal

First recorded in 1860–65
Also called bladdernose.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for hooded seal

hooded seal

noun
  1. a large greyish earless seal, Cystophora cristata, of the N Atlantic and Arctic Oceans, having an inflatable hoodlike sac over the nasal regionAlso called: bladdernose
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