menstrual cycle

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

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

The lack of research that includes female participants is partly down to menstrual cycles and fluctuating hormones, making it more "complicated to track", Ms Patel explains.

From BBC

The menstrual cycle is orchestrated by the rhythmic fluctuations of two hormones – oestrogen and progesterone.

From BBC

Research also suggests oestrogen peaks during menstrual cycles can reduce joint stability.

From BBC

Women who tracked their menstrual cycle using smartphone apps have been warned about the privacy and safety risks of doing so.

From BBC

She began to realise that her symptoms coincided with her menstrual cycle, and started to make a record of them.

From BBC