premenstruum

noun
pre·​men·​stru·​um | \ -ˈmen(t)-strə-wəm How to pronounce premenstruum (audio) \
plural premenstruums or premenstrua\ -​strə-​wə How to pronounce premenstrua (audio) \

Medical Definition of premenstruum

: the period or physiological state that immediately precedes menstruation

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