ZYGOSPHENE
Noun
zygosphene (plural zygosphenes)
(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
Source: Wiktionary
Zyg"o*sphene, n. Etym: [Gr. (Anat.)
Definition: 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.
Source: Webster’s Unabridged Dictionary 1913 Edition