O*pis`tho*bran"chi*a (?), O*pis`tho*bran`chi*a"ta (?), n. pl. [NL., from Gr. behind + gills.] Zool.

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

 

© Webster 1913.

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