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Discharge of an ovum or ovule from the ovary.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



the discharge of the ovum from the ovary into the body cavity. The follicle that contains the ovum ruptures during ovulation; in humans and mammals it is called the Graafian follicle. Ovulation occurs periodically in females of most vertebrates and in women. In some animals, for example, the rabbit, cat, and polecat, it is triggered by copulation. It is stimulated by gonadotrophic hormones, which are secreted by the pituitary gland and are controlled by the central nervous system. In birds the number of daylight hours is a signal for ovulation; in fish, water temperature.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
If you have longer menstrual cycles, ovulation may occur closer to day 21.
Market Research Future (MRFR) states in its new report that the Global Ovulation Test Market had been valued at USD 1000 million in 2016 and is projected to touch the valuation of USD 2500 by 2023.
[4] The least expensive method of confirming ovulation is for the patient to her temperature each morning on a basal body temperature chart.
(By the way, being underweight can also cause ovulation to cease.) For women with PCOS who are not overweight, not ovulating, but don't want to get pregnant, hormonal contraception can serve a dual purpose; besides being effective birth control, oral contraceptives, periodic progestin therapy, or a progestin-releasing IUD will reduce the risk of developing uterine cancer.
Because of a high degree of variation that exists between the estrus onset and ovulation, it is necessary to use hormones that induce ovulation resulting in a successful FTAI.
The ultrasound examinations were performed daily from detection of a preovulatory follicle with a diameter [greater than or equal to]35 mm until the day of ovulation. The diameter of the preovulatory follicle, edema of endometrial folds and intrauterin fluid accumulation were evaluated ultrasonographically.
If you've had surgery, scar tissue can cause ovulation pain by restricting the ovaries and surrounding structures.
Johnson's team determined this by testing 33 women with three batches of each digital home ovulation test as well as with transvaginal ultrasonography.
Based on the previous information, the current study aimed to examine alternative methods to improve ovulation rate in Awassi ewes through the use of active immunoneutralization against inhibin-based peptide immunogens and passive immunoneutralization against endogenous inhibin by rabbit steroid free bovine follicular fluid (SFBFF) antiserum, It is also aimed to determine the effect of inhibin immunization on conception, pregnancy and lambing rates in Awassi ewes out of breeding season.