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From The Collaborative International Dictionary of English v.0.44 [gcide]:
Opisthobranchia \O*pis'tho*bran"chi*a\, Opisthobranchiata \O*pis'tho*bran'chi*a"ta\, noun pl. [NL., from Gr. 'o'pisqen behind + ? gills.] (Zo["o]l.) A division of gastropod Mollusca, in which the breathing organs are usually situated behind the heart. It includes the tectibranchs and nudibranchs.
From WordNet (r) 2.0 [wn]:
Opisthobranchia
noun: gastropods having the gills when present posterior to the heart and having no operculum: includes sea slugs; sea butterflies; sea hares [syn: {subclass Opisthobranchia}]
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