CATAMENIA, in Medicine, the monthly evacuations from the uterus of women not with child or not giving suck. They are so called from mensis "month," the period wherein they return. They are also called flowers, courses, &c. By the Jewish law a woman was unclean while the menstrual blood flowed; and the man who touched her, or the moveables she had touched, was declared unclean.—Lev. xv. See MIDWIFERY and MEDICINE.