The Collaborative International Dictionary
Postzygapophyses
Postzygapophysis \Post*zyg`a*poph"y*sis\, n.; pl. Postzygapophyses. [NL. See Post-, and Zygapophysis.] (Anat.) A posterior zygapophysis.
Wiktionary
postzygapophyses
n. (plural of postzygapophysis English)