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

In January, a cycle coach joins the team to lead workshops on syncing not just workouts but nutrition, creativity — even finances — to the menstrual cycle.

From Los Angeles Times • Jan. 14, 2026

"We've noticed the females who are due on their menstrual cycle, gambling increases before the cycle has kicked in," she said.

From BBC • Jan. 7, 2026

Both women have received treatment at the Parkland Place Rehabilitation Centre in north Wales, where clinical staff say they believe the menstrual cycle can have an impact on gambling behaviours.

From BBC • Jan. 7, 2026

Symptoms can start long before your menstrual cycle changes, but a key shift lies in increasingly irregular periods, Rowen says.

From The Wall Street Journal • Nov. 9, 2025

She also made note of her menstrual cycle.

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