o·o·gen·e·sis (???-j?n??-s?s)n. The formation, development, and maturation of an ovum.o?o·ge·net?ic (-j?-n?t??k) 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.oogenesis (?????d??n?s?s) n (Biology) the formation and maturation of ova from undifferentiated cells in the ovary. See also oocyte oogenetic adjCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014o?o?gen?e?sis (?o? ??d??n ? s?s) n. the formation and development of the ovum. [1890?95] o`o?ge?net?ic (-d???n?t ?k) adj. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.oogenesisthe formative process of the ovum in preparation for fertilization and subsequent development. ? oogenetic, adj.See also: Biology-Ologies & -Isms. Copyright 2008 The Gale Group, Inc. All rights reserved.