menstruum

noun

1
the monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause
the women were sickly and subject to excessive menstruation
a woman does not take the gout unless her menses be stopped"--Hippocrates
2
(archaic) a solvent

Also useful for “menstruum”:Unscrambler— Rearrange the letters in “menstruum”