A female ancestral germ cell that divides several times to give rise to an oocyte that, in turn, develops into an ovum (an egg). The second "o" in oogonium is pronounced separately from the first: o·o·gon·i·um. The word was created from the prefix "oo-" (Greek oon, egg) + "gonium" (New Latin for cell) = the egg cell.
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1. Primitive germ cells; proliferate by mitotic division. All oogonia develop into primary oocytes prior to birth; no oogonia are present after birth. 2. In fungi, the female gametangium bearing one or more oospores. [G. oon, egg, + gone, generation]

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oo·go·ni·um .ō-ə-'gō-nē-əm n a descendant of a primordial germ cell that gives rise to oocytes
oo·go·ni·al -nē-əl adj

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n. (pl. oogonia)
a cell produced at an early stage in the formation of an ovum (egg cell). Primordial germ cells that have migrated to the embryonic ovary multiply to form numerous small oogonia. After the fifth month of pregnancy they enter the early stages of the first meiotic division to form the oocyte. See also oogenesis.

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oo·go·ni·um (o″o-goґne-əm) pl. oogoґnia [oo- + Gr. gonē generation] 1. a primordial oocyte during fetal development; it is derived from a primordial germ cell, multiplies rapidly, then becomes encapsulated in primordial follicle cells and, near the time of birth, becomes a primary oocyte by entering into prophase of the first maturation division. 2. in certain fungi and algae, the female gametangium containing one or more eggs (oospheres).

Medical dictionary. 2011.

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  • Oogonium — Gray s subject #3 38 MeSH Oogonia Oogonium (plural oogonia) may refer to either a primordial oocyte in a female fetus …   Wikipedia

  • oogonium — OOGÓNIUM s.n. Oogon. [pron. o o go ni um. / < germ. Oogonium, cf. it. oogonio]. Trimis de LauraGellner, 13.09.2007. Sursa: DN …   Dicționar Român

  • Oogonium — O [ o]*go ni*um, n.; pl. L. {O[ o]gonia}, E. {O[ o]goniums}. [NL., fr. Gr. w, o n an egg + ? offspring.] (Bot.) A special cell in certain cryptogamous plants containing o[ o]spheres, as in the rockweeds ({Fucus}), and the orders {Vaucherie[ae]}… …   The Collaborative International Dictionary of English

  • oogonium — oogonium. См. оогоний. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • Oŏgonĭum — (v. griech. ōŏn, »Ei«), das weibliche, die zur Empfängnis bereite Eizelle enthaltende Organ mancher Algen u. Pilze, das nach empfangener Befruchtung die Ei oder Oosporen erzeugt (s. Algen u. Pilze) …   Meyers Großes Konversations-Lexikon

  • Oogonium — Oŏgonĭum (grch.), das weibliche Fortpflanzungsorgan vieler Algen und Pilze, aus welchem nach Befruchtung die Oosporen hervorgehen …   Kleines Konversations-Lexikon

  • Oogonium — Oogonium, 1) Pflanzen: meist einzelliges Gametangium bei Algen und Pilzen mit ⇒ Oogamie, in dem eine oder mehrere Eizellen gebildet werden; 2) Tiere: Urkeimzelle im Eierstock der Metazoen, aus der bei der ⇒ Oogenese das Ei entsteht …   Deutsch wörterbuch der biologie

  • oogonium — [ō΄ōgō′nē əm , ō΄əgō′nē əm] n. pl. oogonia [ō΄ō gō′nēə, ō΄ə gō′nēə] or oogoniums [ModL < OO + GONIUM] 1. the female reproductive organ in certain algae and fungi, consisting of a large cell in which the eggs (oospheres) are developed 2.… …   English World dictionary

  • Oogonium — Antheridium (rot) und Oogon (rechts daneben) der Armleuchteralge Chara contraria Als Oogon oder Oogonium wird bei einigen Algen und Pilzen die unbewegliche Eizelle (die Oosphäre) mit ihrer Umhüllung bezeichnet. (Oogonium; vom Griechischen oon …   Deutsch Wikipedia

  • oogonium — Female sexual structure in certain algae and fungi, containing one or more gametes. After fertilization the oogonium contains the oospore …   Dictionary of molecular biology

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