Definition of "sea mouse" []

• Any of various large marine polychete worms of the genus Aphrodite, especially A. aculeata, having a flattened elliptic body with overlapping scales covered by long hairs. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.