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From The Collaborative International Dictionary of English v.0.48:
Zygosphene \Zyg"o*sphene\, n. [Gr. zygo`n a yoke + ? a wedge.] (Anat.) 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. [1913 Webster]