Menstruate \Men"stru*ate\, v. i. [imp. & p. p. {Menstruated}; p. pr. & vb. n. {Menstruating}.] To discharge the menses; to have the catamenial flow. [1913 Webster]
menstruating \menstruating\ adj. discharging menstrual fluid; -- of women during their menstrual period. Syn: unwell. [WordNet 1.5]