See menstruate for more menstruationSee main entry: menstruate men·stru·ationBrE /ˌmenstruˈeɪʃn/ 🔊NAmE /ˌmenstruˈeɪʃn/ 🔊 noun [uncountable] (formal) the process or time of menstruating 行经;月经来潮 ➡ compare period noun (5)