Opisthobranchia :: Opisthobranchia (n. pl.) Alt. of Opisthobranchiat.

Opisthobranchiata :: Opisthobranchiata (n. pl.) A division of gastropod Mollusca, in which the breathing organs are usually situated behind the heart. It includes the tectibranchs and nudibranchs..

Opisthobranchiate :: Opisthobranchiate (a.) Of or pertaining to the Opisthobranchiata.

Opisthobranchiate :: Opisthobranchiate (n.) One of the Opisthobranchiata.

Opisthocoelian :: Opisthocoelian (a.) Alt. of Opisthocoelou.

Opisthocoelous :: Opisthocoelous (a.) Concave behind; -- applied especially to vertebrae in which the anterior end of the centrum is convex and the posterior concave.

Opisthodome :: Opisthodome (n.) A back chamber; especially, that part of the naos, or cella, farthest from the main entrance, sometimes having an entrance of its own, and often used as a treasury..

Opisthoglypha :: Opisthoglypha (n. pl.) A division of serpents which have some of the posterior maxillary teeth grooved for fangs.

Opisthography :: Opisthography (n.) A writing upon the back of anything, as upon the back of a leaf or sheet already written upon on one side..

Opisthomi :: Opisthomi (n. pl.) An order of eellike fishes having the scapular arch attached to the vertebrae, but not connected with the skull..

Opisthopulmonate :: Opisthopulmonate (a.) Having the pulmonary sac situated posteriorly; -- said of certain air-breathing Mollusca.

Opisthotic :: Opisthotic (n.) The inferior and posterior of the three elements forming the periotic bone.

Opisthotonos :: Opisthotonos (n.) A tetanic spasm in which the body is bent backwards and stiffened.

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