The Collaborative International Dictionary
Zygapophysis
Zygapophysis \Zyg`a*poph"y*sis\, n.; pl. Zygapophyses. [Gr. ? a yoke + E. apophysis.] (Anat.) One of the articular processes of a vertebra, of which there are usually four, two anterior and two posterior. See under Vertebra. -- Zyg`ap*o*phys"i*al, a.
Wiktionary
zygapophysis
n. (context anatomy English) One of the articular processes of a vertebra, of which there are usually four, two superior and two inferior.