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

  • n. A cell that arises from a primordial germ cell and differentiates into an oocyte in the ovary.
  • n. A female reproductive structure in certain thallophytes, usually a rounded cell or sac containing one or more oospheres.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An immature ovarian egg within a developing fetus

from the GNU version of the Collaborative International Dictionary of English

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

from The Century Dictionary and Cyclopedia

  • n. In botany, the female sexual organ in certain cryptogamic plants.
  • n. In zoology: The primordial mother-cell which gives rise to the ovum and its follicle.
  • n. 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.


oo- + New Latin gonium, cell (from Greek gonos, seed; see gono-).
(American Heritage® Dictionary of the English Language, Fourth Edition)



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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