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opisthobranchiata |
1 definition found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Opisthobranchia \O*pis`tho*bran"chi*a\, Opisthobranchiata \O*pis`tho*bran`chi*a"ta\, n. pl [NL., from Gr ? 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.
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