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n. pl. o·o·go·ni·a (-nē-ə) or o·o·go·ni·ums
1. Any of the cells that give rise through mitosis to the oocytes and are found in the ovaries of vertebrates.
2. A female reproductive structure in certain thallophytes and in oomycetes, usually a rounded cell or sac containing one or more oospheres.

[oo- + New Latin gonium, cell (from Greek gonos, seed; see gono-).]

o′o·go′ni·al (-nē-əl) 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.


n, pl -nia (-nɪə) or -niums
1. (Biology) an immature female germ cell forming oocytes by repeated divisions
2. (Botany) a female sex organ of some algae and fungi producing female gametes (oospheres)
ooˈgonial adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌoʊ əˈgoʊ ni əm)

n., pl. -ni•a (-ni ə) -ni•ums.
1. one of the undifferentiated germ cells giving rise to oocytes.
2. the one-celled female reproductive organ in certain fungi, usu. a spherical sac containing one or more eggs.
o`o•go′ni•al, adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.