Source : Webster's Revised Unabridged Dictionary (1913)

Menstruate \Men"stru*ate\, a.
   Menstruous. [Obs.]

Menstruate \Men"stru*ate\, v. i. [imp. & p. p. {Menstruated}; p.
   pr. & vb. n. {Menstruating}.]
   To discharge the menses; to have the catamenial flow.

Source : WordNet®

menstruate
     v : undergo menstruation; "She started menstruating at the age
         of 11" [syn: {flow}]