Occurring or existing after menstruation. Later also: designating the age of a fetus or infant as reckoned from the first day of the mother's…

Occurring or experienced before menstruation; (of a woman) in the (late luteal) stage of the menstrual cycle which precedes menstruation, about to…

Of menstruation, etc.: not accompanied by ovulation.

anovulatory; also, lacking an ovum.

Physiology. Occurring in the middle of the menstrual cycle.

colloquial. Of a woman: that has not started her menstrual period by the expected date.

Of, relating to, or occurring during the paramenstruum.