| n. | 1. | Any substance which dissolves a solid body; a solvent. |
| Noun | 1. | menstruum - (archaic) a solvent |
| 2. | menstruum - 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 |