Lewis & Short

Drŭĭdes, um (Drŭĭdae, ārum, Cic. Div. 1, 41; Tac. A. 14, 30; id. H. 4, 54; Suet. Claud. 25; Luc. 1, 451.
Dub. form acc. Druidas, Mel. 3, 2, 3; Plin. 30, 1, 4, § 13), m.,

  1. I. the Druids, the priests and wise men of the Gauls, Caes. B. G. 6, 13 sq.; Luc. 1. 1.; Plin. 16, 44, 95, § 249.
    Hence,
  2. II. Drŭïas, ădis, f., a Gallic priestess and prophetess, a Druidess, Lampr. Alex. Sev. 60.
    Called also Drŭis, ĭdis, Inscr. Orell. 2200; Vop. Aur. 44; Numer. 15.