- premenstruum
- The few days preceding menstruation. [pre- + L. menstruum, ntr. of menstruus, monthly, pertaining to menstruation]
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pre·men·stru·um -'men(t)-strə-wəm n, pl -stru·ums or -strua -strə-wə the period or physiological state that immediately precedes menstruation* * *
n.the stage of the menstrual cycle immediately preceding menstruation.* * *
pre·men·stru·um (pre-menґstroo-əm) pl. premenstrua [L.] the interval immediately preceding a menstrual period.
Medical dictionary. 2011.