![](https://webarchive.library.unt.edu/eot2008/20090514043448im_/http://www.cancer.gov/images/spacer.gif) |
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(MEN-stroo-al)
![](https://webarchive.library.unt.edu/eot2008/20090514043448im_/http://www.cancer.gov/images/spacer.gif)
| The monthly cycle of hormonal changes from the beginning of one menstrual period to the beginning of the next. |
Previous Definitions: | meningioma, meningitis, menopausal hormone therapy, menopause, menorrhagia | Next Definitions: | menstrual period, menstruation, mental health, mental health counselor, meperidine hydrochloride |
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![](https://webarchive.library.unt.edu/eot2008/20090514043448im_/http://www.cancer.gov/images/spacer.gif) |