An anteocular structure; esp. = preocular, n. Now rare.

A double cavity on the posterior side of the neural arch of each ordinary vertebra in serpents and some lizards, into which the zygosphene of the…

A double wedge-shaped projection on the anterior side of the neural side of each ordinary vertebra in serpents and some lizards, which fits into the…

Zoology. In a snake or lizard: a scale situated immediately in front of the eye.

Zoology. Either of a pair of plates on the occipital region in certain snakes. Obsolete. rare.

one of the paired eversible copulatory organs in snakes and lizards.