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