opisthobranch

noun
opis·​tho·​branch | \ ə-ˈpis-thə-ˌbraŋk How to pronounce opisthobranch (audio) \
plural opisthobranchs

Definition of opisthobranch

: any of a subclass (Opisthobranchia) of marine gastropod mollusks that have the gills when present posterior to the heart and often lack a shell

Other Words from opisthobranch

opisthobranch adjective

First Known Use of opisthobranch

1851, in the meaning defined above

History and Etymology for opisthobranch

New Latin Opisthobranchia, from Greek opisthen behind (akin to Greek epi on) + branchia gills — more at epi-

Keep scrolling for more

Learn More about opisthobranch

Statistics for opisthobranch

Look-up Popularity

Time Traveler for opisthobranch

The first known use of opisthobranch was in 1851

See more words from the same year

More from Merriam-Webster on opisthobranch

Britannica.com: Encyclopedia article about opisthobranch

Comments on opisthobranch

What made you want to look up opisthobranch? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

to make a temporary encampment

Get Word of the Day daily email!

Test Your Vocabulary

Musical Words Quiz

  • gramophone
  • Which word describes a musical performance marked by the absence of instrumental accompaniment?
True or False

Test your knowledge - and maybe learn something along the way.

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!