menstruous

from The Collaborative International Dictionary of English v.0.48

Menstruous \Men"stru*ous\, a. [L. menstruus, fr. mensis month.
   Cf. {Menstruum}.]
   1. Having the monthly flow or discharge; menstruating.
      [1913 Webster]

   2. Of or pertaining to the monthly flow; catamenial.
      [1913 Webster]