The release of the ripe egg from the ovary. The egg is released when the cavity surrounding it (the follicle) breaks open in response to a hormonal signal. Ovulation occurs around fourteen or fifteen days from the first day of the woman’s last menstrual cycle. When ovulation occurs, the ovum moves into the fallopian tube and becomes available for fertilization.
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Release of an ovum from the ovarian follicle.
- anestrous o. discharge of ova occurring in animals without estrus.
- paracyclic o. obsolete term for o. occurring in the menstrual cycle at any time other than the normally anticipated time.

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ovu·la·tion .äv-yə-'lā-shənalso .ōv- n the discharge of a mature ovum from the ovary
ovu·late 'äv-yə-.lātalso 'ōv- vi, -lat·ed; -lat·ing

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the process by which an ovum is released from a mature Graafian follicle. The fluid-filled follicle distends the surface of the ovary until a thin spot breaks down and the ovum floats out surrounded by a cluster of follicle cells (the cumulus oophoricus) and starts to travel down the Fallopian tube to the uterus. Ovulation is stimulated by the secretion of luteinizing hormone by the anterior pituitary gland.

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ovu·la·tion (ov″u-laґshən) the discharge of a secondary oocyte from a vesicular ovarian follicle. ovulatory adj


Medical dictionary. 2011.

Look at other dictionaries:

  • Ovulation — is the process in a female s menstrual cycle by which a mature ovarian follicle ruptures and discharges an ovum (also known as an oocyte, female gamete, or casually, an egg). Ovulation also occurs in the estrous cycle of other female mammals,… …   Wikipedia

  • ovulation — [ ɔvylasjɔ̃ ] n. f. • 1855; de ovule ♦ Chez les mammifères, Libération de l ovule après rupture du follicule ovarien. L ovulation, stade du cycle ovarien. Absence d ovulation. ⇒ anovulation. Substance, contraceptif qui inhibe l ovulation. ⇒… …   Encyclopédie Universelle

  • ovulation — [äv΄yə lā′shən ō΄vyəlā′shən] n. 〚 OVULE + ATION〛 the process by which a mature ovum escapes from an ovary ovulatory [äv΄yo͞olə tôr΄ē, äv΄yələ tôr΄ē; ō΄vyo͞olə tôr΄ē, ō΄vyələ tôr΄ē] adj. * * * See ovulate. * * * …   Universalium

  • ovulation — o vu*la tion, n. (Physiol.) The formation of ova or eggs in the ovary, and the discharge of the same. In the human female the discharge occurs about halfway between menstruation times. [1913 Webster +PJC] …   The Collaborative International Dictionary of English

  • ovulation — ovulation. См. овуляция. (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.

  • Ovulation — (lat.), der Austritt des reisen Eies (durch Platzen der Follikel) aus dem Eierstock …   Meyers Großes Konversations-Lexikon

  • Ovulation — Ovulation, Follikelsprung, Eisprung, Ausstoßen der Oocyte aus dem Eierstock in der fortpflanzungsaktiven Periode der Wirbeltiere. Bei den Säugetieren wird die O. von den Hypophysenhormonen FSH und LH ausgelöst. Die O. des Menschen findet etwa in… …   Deutsch wörterbuch der biologie

  • ovulation — (n.) 1848, from Mod.L. ovulum (see OVULE (Cf. ovule)) …   Etymology dictionary

  • ovulation — [äv΄yə lā′shən ō΄vyəlā′shən] n. [ OVULE + ATION] the process by which a mature ovum escapes from an ovary ovulatory [äv΄yo͞olə tôr΄ē, äv΄yələ tôr΄ē; ō΄vyo͞olə tôr΄ē, ō΄vyələ tôr΄ē] adj …   English World dictionary

  • Ovulation — L’ovulation est la libération d’un ovule par l’ovaire. Cet événement est important pour la reproduction, en effet, l’ovule forme avec le spermatozoïde, l’une des deux cellules qui forment l’embryon après leur rencontre. Pour être plus précis,… …   Wikipédia en Français

  • Ovulation — Aufnahme einer Ovulation Vorgänge im Eierstock während der Eizellenreifung Als Follikelsprung, Ovulation oder Eisprung wird die Ausstoßung der unbefruchteten Eizelle aus dem …   Deutsch Wikipedia

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