Main Entry: men·stru·um

Pronunciation: \ˈmen(t)-strü-əm, -strəm\

Function: noun

Inflected Form(s): plural men·stru·ums or -strua\-strü-ə, -strə\

Etymology: Medieval Latin, literally, menses, alteration of Latin menstrua

Date: 1559

: a substance that dissolves a solid or holds it in suspension : solvent