zyg·a·poph·y·sis (z?g??-p?f??-s?s, z??g?-)n. pl. zyg·a·poph·y·ses (-s?z?) One of two usually paired processes of the neural arch of a vertebra that articulates with corresponding parts of adjacent vertebrae.zyg?ap·o·phys?e·al, zyg?ap·o·phys?i·al (z?g??p-?-f?z??-?l, z??g?p-) adj.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.zygapophysis (?z????p?f?s?s; ?za???-) n, pl -ses (-?si?z) 1. (Anatomy) anatomy zoology one of several processes on a vertebra that articulates with the corresponding process on an adjacent vertebra2. (Zoology) anatomy zoology one of several processes on a vertebra that articulates with the corresponding process on an adjacent vertebra[C19: from zygo- + apophysis] zygapophyseal, zygapophysial adjCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014zyg?a?poph?y?sis (?z?g ??p?f ? s?s, ?za? g?-) n., pl. -ses (-?siz) one of the four processes of a vertebra, occurring in pairs that interlock each vertebra with the vertebrae above and below. [1850?55] Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.