Lewis & Short

vĕnēfĭcus, a, um, adj. [venenum-facio], poisoning, poisonous; sorcerous, magic, magical.

  1. I. Adj.: verba, Ov. M. 14, 365: artes, Plin. 30, 2, 6, § 17: aspectus, id. 28, 3, 6, § 30: chamaeleon, Sol. 25 med.: percussor, Curt. 4, 11, 18.
  2. II. Substt.: vĕnēfĭ-cus, i, m., a poisoner, sorcerer, wizard; and vĕnēfĭca, ae, f., a sorceress, witch, Cic. Cat. 2, 4, 7; id. Inv. 2, 19, 58; Quint. 9, 2, 105; Sen. Ira, 1, 16, 1; id. Ben. 5, 13, 4; Quint. 7, 8, 2; Hor. Epod. 5, 71; Ov. H. 6, 19; id. M. 7, 316 (of Medea); Sen. Ep. 9, 6.
    Fem., as a term of abuse, Plaut. Pers. 2, 4, 7; Ter. Eun. 5, 1, 9; Anton. ap. Cic. Phil. 13, 11, 25.