adj. 1. Of or relating to menstruation. 2. a. Taking place on a monthly basis. b. Lasting for one month. [Middle English, from Old French menstruel, from Latin mēnstruālis, from mēnstruus, menstrual, from mēnsis, month; see mē-2 in the Appendix of Indo-European roots.] |
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.