oogonium
Americannoun
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one of the undifferentiated germ cells giving rise to oocytes.
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the one-celled female reproductive organ in certain thallophytes, usually a more or less spherical sac containing one or more eggs.
noun
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an immature female germ cell forming oocytes by repeated divisions
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a female sex organ of some algae and fungi producing female gametes (oospheres)
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A female reproductive structure in certain algae and fungi. It is usually a rounded cell or sac containing one or more oospheres.
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A cell that arises from a primordial germ cell and differentiates into an oocyte in the ovary of female animals.
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Nouns
Etymology
Origin of oogonium
From New Latin, dating back to 1865–70; see origin at oo-, -gonium
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
See Examples For:
The oogonium undergoes mitosis to produce about one to two million oocytes by the time of birth.
From Textbooks ● Apr. 25, 2013
In oogenesis, this germ cell is called an oogonium and forms during the embryological development of the individual.
From Textbooks ● Apr. 25, 2013
For example, one sentence on cell division begins, "Meiosis is somewhat more complicated because its purpose is to result in a spermatogonium or oogonium with half the original chromosome number..."
From Time Magazine Archive
It is presumable that here, as in the Algæ, the spermatozoids introduce themselves into the cavity of the oogonium, and unite with the gonospheres.
From Fungi: Their Nature and Uses by Cooke, M. C. (Mordecai Cubitt)
Monoblepharis has oogonia with single oospheres and antheridia developing a few amoeboid uniciliate antherozoids; these creep to the opening of the oogonium and then swim in.
From Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" by Various
The oogonia produce primary oocytes that are arrested in prophase I of meiosis from the time of birth until puberty.
From Textbooks ● Jan. 1, 2015
At about 5 months gestation, the ovaries contain approximately six to seven million oogonia, which initiate meiosis.
From Textbooks ● Jan. 1, 2015
Unlike spermatogonia, however, oogonia form primary oocytes in the fetal ovary prior to birth.
From Textbooks ● Jun. 19, 2013
Without SRY, different genes are expressed, oogonia form, and primordial follicles develop in the primitive ovary.
From Textbooks ● Jun. 19, 2013
In Botrytis and in Polyactis, the flocci and spores are similar, but the branches of the threads are shorter and more compact, and the septa are more common and numerous; the oogonia also are absent.
From Fungi: Their Nature and Uses by Cooke, M. C. (Mordecai Cubitt)
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
