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menstruous

[men-stroo-uh s, -struh s] /ˈmɛn stru əs, -strəs/
adjective
1.
pertaining to menstruation.
Origin
1375-1425
1375-1425; late Middle English: menstruating < Latin mēnstruus monthly; see menstruate, -ous
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin and History for menstruous
adj.

1530s, from French menstrueus, from Latin *menstruosus, from menstruum, from menstruus (adj.) "monthly," from mensis "month" (see moon (n.)).

Online Etymology Dictionary, © 2010 Douglas Harper
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