The Compendium of Caraka 6.30.209

6.30.209

rajaḥ pradīryate yasmāt pradarastena sa smṛtaḥ/
sāmānyataḥ samuddiṣṭaṃ kāraṇaṃ liṅgameva ca//

Because the menstrual fluid flows excessively (pradīryate), it is known as pradara. / In general terms the cause and symptom have been declared;