Zyg`a·poph'y·sis noun ; plural Zygapophyses . [ Greek zygo`n a yoke + English 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... Found on http://www.encyclo.co.uk/webster/Z/7
Greek zygon = yoke, apo = from, physis = growth; the articular process of a vertebra. The downward "growth" of the vertebra above articulates with the upward "growth" of the vertebra below, forming a zygapophyseal joint. Found on http://www.anatomy.usyd.edu.au/glossary/glossary.cgi?