Lewis & Short

Baptae, ārum, m., = Βάπται [perh. so called from dyeing their hair; v. Meineke, Com. Fragm. I. p. 119], priests of the Thracian, afterwards Athenian, goddess Cotytto, whose festival was celebrated in a very lewd manner, Juv. 2, 92 Schol.; cf. Cotytto.