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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.
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References in periodicals archive ?
Occasionally oogonial nests were found amongst the connective tissue and beside the post-ovulatory follicles (Fig.
Anderson, "Isolation, purifi cation, and culture of oogonial stem cells from adult human and bovine ovarian cortex," Lancet, vol.
As regards females, the presence of oogonial proliferation, early prophase oocytes, previtellogenic oocytes, vitellogenic (early vitellogenic oocytes, middle vitellogenic oocytes) and full-grown oocytes, empty ovarian tubules and atretic oocytes were considered.
The most germ cells enclosed in the oogonial cysts and a few numbers outside the cysts where oogonia organized in clusters connected by intercellular bridges and surrounded by stromal cells.
Citation: Hua Zhang et al., "Adult human and mouse ovaries lack DDX4-expressing functional oogonial stem cells," Nature Medicine, 2015; 21 (10): 1116 DOI: 10.1038/nm.3775
But recent findings in animals and humans showed that neonatal and adult ovaries possess rare numbers of oogonial stem cells (OSCs) that can stably proliferate for months and produce mature oocytes in vitro, similar to that of the spermatogonial stem cell in adult testis.
Among macroalgae, for example, Steen (2004) found that fertilization in Sargassum muticum was impaired at salinities of 15 ppt and below, even though oogonial extrusion occurred normally at salinities as low as 10 ppt, and germlings survived at salinities as low as 5 ppt; the tentative conclusion was that sperm were especially sensitive to low salinities.