oogonia

oogonium

[oh-uh-goh-nee-uhm]
noun, plural oogonia [oh-uh-goh-nee-uh] , oogoniums. 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:
1865–70; < Neo-Latin; see oo-, -gonium

oogonial, adjective
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World English Dictionary
oogonium (ˌəʊəˈɡəʊnɪəm)
 
n , pl -nia, -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)
 
oo'gonial
 
adj

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American Heritage
Medical Dictionary

oogonium o·o·go·ni·um (ō'ə-gō'nē-əm)
n. pl. o·o·go·ni·ums or o·o·go·ni·a (-nē-ə)
The primitive egg mother cell from which the oocytes develop.


o'o·go'ni·al (-nē-əl) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
oogonium   (ō'ə-gō'nē-əm)  Pronunciation Key 
Plural oogonia or 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 © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

oogonia

the female reproductive organ in ferns and mosses. An archegonium also occurs in some gymnosperms, e.g., cycads and conifers. A flask-shaped structure, it consists of a neck, with one or more layers of cells, and a swollen base-the venter-which contains the egg. Neck-canal cells, located above the egg, disappear as the archegonium matures, thus producing a passage for entry of the sperm. The sperm are produced in the corresponding male reproductive organ, the antheridium.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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