any gastropod of the order Aplysiacea, comprising large marine sluglike mollusks with a reduced, internal shell.
Origin of sea hare
First recorded in 1585–95
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for sea hare
Indeed I actually showed this small fish, which you call a sea-hare, to many who stood by.
For, as a matter of fact, he has not as yet67 ever come across a sea-hare.
British Dictionary definitions for sea hare
any of various marine gastropods of the order Aplysiomorpha (or Anaspidea), esp Aplysia punctata, having a soft body with an internal shell and two pairs of earlike tentacles
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