menstrual cycle

Scientific  

/ mĕn′stro̅o̅-əl /

1. The recurring monthly series of physiological changes in women and other female primates in which an egg is produced in the process known as ovulation, and the uterine lining thickens to allow for implantation if fertilization occurs. If the egg is not fertilized, the lining of the uterus breaks down and is discharged during menstruation.

2. See also ovulation menstruation

---

menstrual cycle Cultural  

1. The periodic series of changes in the female reproductive system associated with the preparation of the uterus for pregnancy; the cycle is repeated roughly every twenty-eight days. During the menstrual cycle, an ovum is released from one of the ovaries (the release is called ovulation), and the uterus develops an inner lining enriched with blood to prepare it for the possible implantation of a zygote. If fertilization and implantation do not take place, the lining of the uterus is discharged during menstruation.

---

Example Sentences

See Examples For:

menstrual cycle

Lauren went on to explain the phases of the menstrual cycle was not something she knew about until after having children.

From BBC ● Aug. 16, 2026

Her home experiment, which she and Johnson are broadcasting on social media, is aimed at mapping her biological data over the course of her menstrual cycle.

From The Wall Street Journal ● Jul. 13, 2026

In recent months, Whoop made a push for more female members, partly by expanding its hormonal insights and menstrual cycle modeling in its app.

From The Wall Street Journal ● Jul. 8, 2026

Endometriosis is driven by female hormones - oestrogen and progesterone - linked to the menstrual cycle.

From BBC ● Jul. 7, 2026

She also made note of her menstrual cycle.

From "Charles and Emma: The Darwins' Leap of Faith" by Deborah Heiligman