Opisthobranchia

plural noun
Opis·​tho·​bran·​chia

Definition of Opisthobranchia

zoology
: a large order of Euthyneura comprising marine gastropod mollusks having the gills when present posterior to the heart and having no operculum — compare streptoneura — see nudibranchia, tectibranchia

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

Other Words from Opisthobranchia

opisthobranchiate \ ⸗¦⸗⸗¦braŋkēə̇t , -​ēˌāt \ adjective or noun

History and Etymology for Opisthobranchia

New Latin, from opisth- + -branchia

Learn More About Opisthobranchia

Dictionary Entries Near Opisthobranchia

opisthobranch

Opisthobranchia

Opisthobranchiata

See More Nearby Entries 

Statistics for Opisthobranchia

Cite this Entry

“Opisthobranchia.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Opisthobranchia. Accessed 28 Nov. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

WORD OF THE DAY

Test Your Vocabulary

Farm Idioms Quiz

  • cow coming home
  • What does 'poke' refer to in the expression 'pig in a poke'?
Spell It

Can you spell these 10 commonly misspelled words?

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!