• Webster's Revised Unabridged Dictionary
    • n Oögonium (Bot) A special cell in certain cryptogamous plants containing oöspheres, as in the rockweeds (Fucus), and the orders Vaucherieæ and Peronosporeæ.
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Century Dictionary and Cyclopedia
    • n oogonium In botany, the female sexual organ in certain cryptogamic plants. It is usually a more or less spherical sac, without differentiation into neck and venter as in the archefonium, and contains one or more oöspheres, which after fertilization become oöspores. Compare antheridium, and see cut under conceptacle.
    • n oogonium In zoology: The primordial mother-cell which gives rise to the ovum and its follicle.
    • n oogonium 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.
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Webster's Revised Unabridged Dictionary
NL., fr. Gr. w,'o`n an egg + offspring