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WordNet

menstruum

  1. n. (archaic) a solvent

  2. 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; "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 [syn: menstruation, menses, catamenia, period, flow]

  3. [also: menstrua (pl)]

menstrua

See menstruum

The Collaborative International Dictionary

Menstrua

Menstruum \Men"stru*um\, n.; pl. E. Menstruums, L. Menstrua. Any substance which dissolves a solid body; a solvent.

The proper menstruum to dissolve metal.
--Bacon.

All liquors are called menstruums which are used as dissolvents, or to extract the virtues of ingredients by infusion or decoction.
--Quincy.

Note: The use is supposed to have originated in some notion of the old chemists about the influence of the moon in the preparation of dissolvents.
--Johnson.

Wiktionary

menstrua

n. (plural of menstruum English)