zygosphene

Century Dictionary and Cyclopedia

1. n. In herpetology, the wedge-shaped process from the fore part of the neural arch of the vertebræ of serpents and some lizards, which fits into a corresponding fossa, the zygantrum, on the posterior part of the neural arch of a preceding vertebra, and serves thus to interlock the series of arches more effectually than would be done by zygapophyse's alone. Compare cut under zygantrum

Wiktionary

1. n. anatomy A median process on the front part of the neural arch of the vertebrae of most snakes and some lizards, which fits into a fossa called the zygantrum on the back part of the arch in front.

GNU Webster's 1913

1. n. (Anat.) A median process on the front part of the neural arch of the vertebræ of most snakes and some lizards, which fits into a fossa, called the zygantrum, on the back part of the arch in front.