the GNU version of the Collaborative International Dictionary of English
adj. Having the monthly flow or discharge; menstruating.
adj. Of or pertaining to the monthly flow; catamenial.
The Century Dictionary and Cyclopedia
Having the monthly flow or discharge, as a female.
Pertaining to the monthly flow of females.
In botany, lasting for a month.
Word Usage
"If a woman begins to menstruate on the same day of the month for three consecutive months, there is a presumption that that is the day when she begins her period and all the detailed regulations concerning a menstruous woman begin at that date."