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the discharge of a secondary oocyte from the graafian follicle; in an adult woman this normally occurs at intervals of about 28 days and alternates between the two ovaries. As a rule, only one secondary oocyte is produced, but occasionally ovulation produces two or more; if more than one subsequently become fertilized, the result may be multiple births, such as twins or triplets. adj., adj ov´ulatory.

Ovulation takes place approximately at the midpoint of the menstrual cycle, 14 days after the onset of menstruation. During the preceding weeks, a graafian follicle (cell cluster in the ovary containing the oocyte) grows from the size of a pinhead to that of a pea. At the moment of ovulation, the follicle bursts open and the ovum is discharged.

The discharged ovum enters the fallopian tube adjoining the ovary and moves toward the uterus; if it encounters a spermatozoon while it is still alive (about 48 hours), the two merge and fertilization takes place, usually in the fallopian tube. The fertilized ovum then makes its way to the uterus, where it becomes embedded in the prepared wall as the first stage of growth of the fetus (see illustration, and see also reproduction). If fertilization does not take place the ovum loses its vitality and the blood and tissue lining the uterus are shed in the menstrual flow.
ovulation method cervical mucus method; see discussion under contraception.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.


(ov'yū-lā'shŭn, ō'vū-),
Release of an ovum from the ovarian follicle.
Farlex Partner Medical Dictionary © Farlex 2012


Release of an oocyte from the ovarian follicle.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012


The release of an OVUM from a mature Graafian follicle in the OVARY. Ovulation occurs about half way between the beginning of consecutive menstrual periods, usually about 14 days before the expected date of onset of the next period.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005


the bursting of the OVARIAN FOLLICLE (See also GRAAFIAN FOLLICLE on the surface of the ovary with the release of an egg which then normally passes into the OVIDUCT.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005


The phase of the female monthly cycle when a developed egg is released from the ovary into the fallopian tube for possible fertilization.
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.

Patient discussion about Ovulation

Q. i just have my period last november 25 and ended on 28.when is my possible fertile and ovulation period please help me identify my fertile and ovulation period

A. If someone knew it, it'd solve the human race many problems with fertility. The problem is that ovulation (and thus, the period of possible fertility) happens 14 days BEFORE the onset of menses, so you know about it only retrospectively.

However there ways such as serial body temperature measuring, along with kits that measures the level of hormones in the urine in order to estimate the time of the coming ovulation, and help in timing intercourse.

You may read more about it here (www.mayoclinic.com/health/ovulation-signs/AN01521 ) but anyway, consulting a doctor (e.g. gynecologist) may be wise.

More discussions about Ovulation
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References in periodicals archive ?
Or, you can look for ovulation symptoms and have sex whenever you detect fertile signs.
The prominent companies that are part of the ovulation test market include Church & Dwight Co.
Our study was a Interventional study and was done to induce ovulation among 100 infertile women (Sample size taken as per convenience) having oligo-ovulation or anovulation.
Inositol may be helpful for many PCOS signs and symptoms; studies of taking 2,000 mg of inositol twice daily show decreased androgen levels, restoration of ovulation, and weight loss.
Many hormones can be used to control the ovulation in swine (DE RENSIS & KIRKWOOD, 2016) and the gonadotropin-releasing hormone (GnRH) analogs have been extensively used as ovulation inducers in FTAI protocols.
ovulation periods after last breeding were investigated with ultrasonography every two days.
And STIs such as chlamydia can cause inflammation and scarring around the Fallopian tubes, leading to ovulation pain.
Equally essential is having a reliable digital test reader that not only detects the LH surge that precedes ovulation but also accurately displays that result.
In the current study, we found that either of the two techniques performed had a positive role for induction of super-ovulation, elevation of ovulation rates and subsequent twins births in Iraqi Awassi ewes out of breeding season.
Low levels of ewe body condition are known to result in the development of a low number of large follicles compared with ewes in high levels of body condition, and these differences are then reflected in the ovulation rates and the reproductive performances of the animals (Rhind and McNeilly, 1998).