1. (

• menstruum

) (archaic) a solvent ;

2. (

• menstruation ,
• menses ,
• menstruum ,
• catamenia ,
• period ,
• flow ,

) 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";