menstrual

The story

1. Latin · derived frommēnstruālis
2. Middle English · inherited frommenstruall
3. English todaymenstrual

From Middle English menstruall, from Latin mēnstruālis, from mēnstrua (“menses”), from neuter plural of mēnstruus (“of a month, monthly, of menstruation”), from mēnsis (“month”) + -ālis (“-al”); see moon.