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Webster's 1913 Dictionary

OPISTHOBRANCHIA; OPISTHOBRANCHIATA

O *pis `tho *bran "chi *a, O *pis `tho *bran `chi *a "ta, n. pl. Etym: [NL. ,from Gr. (Zoöl.)

 

Defn: A division of gastropod Mollusca, in which the breathing organs are usually situated behind the heart. It includes the tectibranchs and nudibranchs.

 

OPISTHOBRANCHIATE

OPISTHOBRANCHIATE O *pis `tho *bran "chi *ate, a. (Zoöl.)

 

Defn: Of or pertaining to the Opisthobranchiata. -- n.

 

Defn: One of the Opisthobranchiata.

 

New American Oxford Dictionary

Opisthobranchia

O pis tho bran chi a |əˌpisTHəˈbraNGkēə əˌpɪsθəˈbræŋkiə |Zoology a group of mollusks that includes the sea slugs and sea hares. They have a small or absent shell and are typically brightly colored with conspicuous external gills. [Subclass Opisthobranchia, class Gastropoda. ] DERIVATIVES o pis tho branch |əˈpisTHəˌbraNGk |noun ORIGIN modern Latin (plural ), from opistho- ‘to the rear ’ + brankhia ‘gills. ’

 

Oxford Dictionary

Opisthobranchia

Opisthobranchia |əˌpɪsθə (ʊ )ˈbraŋkɪə | ▶plural noun Zoology a group of molluscs which includes the sea slugs and sea hares. They have a small or absent shell and are typically brightly coloured with conspicuous external gills. ●Subclass Opisthobranchia, class Gastropoda. DERIVATIVES opisthobranch |əˈpɪsθə (ʊ )braŋk |noun ORIGIN modern Latin (plural ), from opistho- ‘to the rear ’ + brankhia ‘gills ’.