Etymology
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menstruation (n.)

"the period of menstruation," 1680s, from past-participle stem of Late Latin menstruare, from menstruus "monthly" (from mensis "month;" see moon (n.)) + -ation. Old English equivalent was monaðblot "month-blood." Middle English had menstrue (n.), late 14c., from Old French menstrue, from Latin menstruum.

updated on December 25, 2018

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Definitions of menstruation from WordNet

menstruation (n.)
the monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause; "a woman does not take the gout unless her menses be stopped"--Hippocrates; "the semen begins to appear in males and to be emitted at the same time of life that the catamenia begin to flow in females"--Aristotle;
the women were sickly and subject to excessive menstruation
Synonyms: menses / menstruum / catamenia / period / flow
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.