Opisthopulmonate
Opisthopulmonate O*pis`tho*pul"mo*nate, a.[Gr. 'o`pisqen behind + E. pulmonate.] (Zo["o]l.) Having the pulmonary sac situated posteriorly; -- said of certain air-breathing Mollusca. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

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