menstrual cycle

(redirected from Menstrual cycles)
Also found in: Thesaurus, Medical, Encyclopedia.

men·stru·al cycle

The series of bodily changes in women and other female primates in which the lining of the uterus thickens to allow for implantation of a fertilized egg. The cycle takes about a month to complete, with ovulation usually occurring around the midway point. If the egg produced is not fertilized, the lining of the uterus breaks down and is discharged during menstruation.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.menstrual cycle - a recurring cycle (beginning at menarche and ending at menopause) in which the endometrial lining of the uterus prepares for pregnancy; if pregnancy does not occur the lining is shed at menstruation; "the average menstrual cycle is 28 days"
oscillation, cycle - a single complete execution of a periodically repeated phenomenon; "a year constitutes a cycle of the seasons"
fertile period, fertile phase - the time in the menstrual cycle when fertilization is most likely to be possible (7 days before to 7 days after ovulation)
menstrual phase - the phase of the menstrual cycle during which the lining of the uterus is shed (the first day of menstrual flow is considered day 1 of the menstrual cycle)
luteal phase, secretory phase - the second half of the menstrual cycle after ovulation; the corpus luteum secretes progesterone which prepares the endometrium for the implantation of an embryo; if fertilization does not occur then menstrual flow begins
safe period - that time during a woman's menstrual cycle during which conception is least likely to occur (usually immediately before of after menstruation)
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
To reach their findings, the researchers enrolled 88 women of reproductive age who had regular menstrual cycles.
60% of subjects had 5 day menstrual cycles, 30% had 6 days and 10% had a four days of menstruation cycle (Table1).
Ninety-two Iranian high-school girls with heavy menstrual bleeding, regular menstrual periods, and no evidence of gynecological diseases were randomly assigned to receive, in double-blind fashion, 250 mg of powdered ginger or placebo 3 times per day, starting on the day before menstruation and continuing until the third day of the menstrual period, for 3 menstrual cycles. Compared with the 3 menstrual cycles before the study, the mean amount of blood loss during the study was significantly lower by 46.6% in the ginger group and nonsignificantly lower by 2.1 % in the placebo group (p < 0.001 for the difference in the change between groups).
Objective: This study is conducted to compare the risk of thrombo-embolism during different phases of menstrual cycles.
After an overnight, fast blood samples were drawn from an antecubital vein for clinical routine laboratory diagnosed in the second Affiliated Hospital of Wenzhou Medical University on the 2 [sup]nd or 3 [sup]rd day, 14 [sup]th and 28 [sup]th day after menstruation, respectively according to participants' menstrual cycles. In the same way, cylindrical lens, spherical lens, IPD, and visual acuity were detected by the outpatient department of ophthalmology based on automatic optometry method and comprehensive optometry detection.
All patients had regular menstrual cycles ranging in length from 28 to 30 days and had not received exogenous hormonal therapy for at least 2 months before the procedure.
Postmenarche menstrual cycles are commonly irregular and not without risk of pregnancy if the adolescent becomes sexually active.
" Over- exercising for weight loss is messing up with the menstrual cycles of many young women, leading to a condition called amenorrhea, where menstruation just stops," says Dr Singhal.
Major Finding: Significant variations in respiratory symptoms (wheezing, cough, and shortness of breath) during the menstrual cycle were identified in a general population of women with regular menstrual cycles, which has possible implications for individualizing the treatment of respiratory diseases, according to the authors.
Women with naturally occurring menstrual cycles may experience fluctuations in auditory and labyrinthine functions during certain times in their menstrual cycle.
Respiratory drives and exercise in menstrual cycles of athletic and nonathletic women.
The women were followed for up to two menstrual cycles, with serum samples collected up to eight times per cycle; metal concentrations in whole blood were determined at baseline by inductively coupled mass spectroscopy.