zy·gote (z??g?t?)n.1. The cell formed by the union of two gametes, especially a fertilized ovum before cleavage.2. The organism that develops from a zygote.[From Greek zug?tos, yoked, from zugoun, to yoke; see yeug- in Indo-European roots.]zy·got?ic (-g?t??k) adj.zy·got?i·cal·ly adv.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.zygote (?za????t; ?z??-) n1. (Biology) the cell resulting from the union of an ovum and a spermatozoon2. (Biology) the organism that develops from such a cell[C19: from Greek zug?tos yoked, from zugoun to yoke] zygotic adj zy?gotically advCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014zy?gote (?za? go?t, ?z?g o?t) n. the cell produced by the union of two gametes, before it undergoes cleavage. [1885?90;