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[oh-uh-goh-nee-uh m]
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noun, plural o·o·go·ni·a [oh-uh-goh-nee-uh] /ˌoʊ əˈgoʊ ni ə/, o·o·go·ni·ums. Biology.
  1. one of the undifferentiated germ cells giving rise to oocytes.
  2. the one-celled female reproductive organ in certain thallophytes, usually a more or less spherical sac containing one or more eggs.

Origin of oogonium

From New Latin, dating back to 1865–70; see origin at oo-, -gonium
Related formso·o·go·ni·al, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for oogonia

Historical Examples

  • They are reproduced by means of antheridia and oogonia developed in conceptacles, clustered together at the apex of the branches.

    Sea-Weeds, Shells and Fossils

    Peter Gray

  • De Bary has claimed for the oogonia in Cystopus and Peronospora a kind of fecundation which deserves mention here.

    Fungi: Their Nature and Uses

    Mordecai Cubitt Cooke

  • These escape and float passively away when the wall of the oogonia ruptures.

    The Sea Shore

    William S. Furneaux

  • Sexual reproduction by oogonia and antheridia; asexual reproduction by zoospores or conidia.

  • Mycelium present; antheridia but no antherozoids; oogonia with one or more oospheres: Peronosporaceae, Saprolegniaceae.

British Dictionary definitions for oogonia


noun plural -nia (-nɪə) or -niums
  1. an immature female germ cell forming oocytes by repeated divisions
  2. a female sex organ of some algae and fungi producing female gametes (oospheres)
Derived Formsoogonial, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

oogonia in Medicine


n. pl. o•o•go•ni•ums
  1. The primitive egg mother cell from which the oocytes develop.
Related formso′o•goni•al (-nē-əl) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

oogonia in Science


Plural oogonia oogoniums
  1. A female reproductive structure in certain algae and fungi. It is usually a rounded cell or sac containing one or more oospheres.
  2. A cell that arises from a primordial germ cell and differentiates into an oocyte in the ovary of female animals.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.