from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun Any of the cells that give rise through mitosis to the oocytes and are found in the ovaries of vertebrates.
  • noun A female reproductive structure in certain thallophytes and in oomycetes, usually a rounded cell or sac containing one or more oospheres.

from The Century Dictionary.

  • noun In zoology: The primordial mother-cell which gives rise to the ovum and its follicle.
  • noun One of the youngest ovarian cells, characterized by having in its nucleus the same number of chromosomes as in the nuclei of the somatic or body-cells. The oögonia, which eventually give rise to the primary oöcytes, are homologous in the oögenesis with the spermatogonia in the spermatogenesis of the male animal of the same species.
  • noun In botany, the female sexual organ in certain cryptogamic plants.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Bot.) A special cell in certain cryptogamous plants containing oöspheres, as in the rockweeds (Fucus), and the orders Vaucherieæ and Peronosporeæ.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun biology An immature ovarian egg within a developing fetus


from The American Heritage® Dictionary of the English Language, 4th Edition

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



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  • ~ Primitive differentiated female gamete which gives rise to oocytes. Singular of oogonia.

    ~ An immature ovum. It is a female gametogonium.

    ~ Oogonia are formed in large numbers by mitosis early in fetal life from primordial germ cells, which are present in the fetus between weeks 4 and 8. Oogonia are present in the fetus between weeks 5 and 30.

    ~ Oogonia are also the female reproductive structures in certain thallophytes, and are usually rounded cells or sacs containing one or more oospheres.

    January 18, 2009