9 letters · 11 points in Scrabble
adjective of or relating to menstruation or the menses
originFrom 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.
Etymology from Wiktionary, CC BY-SA 3.0