from the GNU version of the Collaborative International Dictionary of English
- adj. Having the pulmonary sac situated posteriorly; -- said of certain air-breathing Mollusca.
from The Century Dictionary and Cyclopedia
- Having posterior lungs: applied to those pulmonale gastropods in which the pulmonary sac is posterior, the ventricle of the heart anterior, the auricle posterior, and the pallial region small: the opposite of prosopulmonate.
Sorry, no etymologies found.