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)