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Of or pertaining to the Opisthobranchiata. -- n.

Concave behind; -- applied especially to vertebræ in which the anterior end of the centrum is convex and the posterior concave.

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.

A division of serpents which have some of the posterior maxillary teeth grooved for fangs.

A writing upon the back of anything, as upon the back of a leaf or sheet already written upon on one side. [R.] Scudamore.

An order of eellike fishes having the scapular arch attached to the vertebræ, but not connected with the skull.

Having the pulmonary sac situated posteriorly; -- said of certain air-breathing Mollusca.

The inferior and posterior of the three elements forming the periotic bone.

A tetanic spasm in which the body is bent backwards and stiffened.

A combining form fr. Gr.

Same as Monotremata. -- Or`ni*tho*del"phid, a.

A fossil track resembling that of a bird. Hitchcock.

The fossil remains of a bird.

Of or pertaining to ornithology.

One skilled in ornithology; a student of ornithology; one who describes birds.

That branch of zoölogy which treats of the natural history of birds and their classification.

Divination by means of birds, their flight, etc. Ornithomancy grew into an elaborate science. De Quincey.

An aviary; a poultry house. Weale.

An extinct order of birds. It includes only the Archæopteryx.

An order of herbivorous dinosaurs with birdlike characteristics in the skeleton, esp. in the pelvis and hind legs, which in some genera had only three functional toes, and supported the body in walking as in Iguanodon. See Illust. in Appendix.