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Zo Zy
Zyga Zygo

Zygapophysis

Noun, plural zygapophyses

1. Any of the articular processes of the neural arch of a vertebra of which there are usually two anterior and two posterior. (merriam-webster.com)

2. One of two usually paired processes of the neural arch of a vertebra that articulates with corresponding parts of adjacent vertebrae. (thefreedictionary.com)