catamenial,a.|kætəˈmiːnɪəl| [f.prec. + -al1.] Pertaining to the catamenia; menstrual. 1851Carpenter Man.Phys. (ed. 2) 314 The Catamenial discharge.1859Todd Cycl.Anat. V. 662/2 The catamenial period and interval together occupy a space of one lunar month.