BT Nid 12b(16) :הדר איתקן‏ : (her menstrual period) became regular again
See the entire entry for hdr vb. to return, go around

BT Nid 12b(16) :דאי{ }הדר איתקן‏ : for it became regular again
See the entire entry for hdr vb. to return, go around