Lewis & Short

prŏfessor, ōris, m. [profiteor],

  1. I. a public teacher, professor, one who makes instruction in any branch a business (post-Aug.): sapientiae professores, Cels. praef. init.: ceterarum artium, Quint. 12, 11, 20: Latinae simul Graecaeque eloquentiae, Suet. Rhet 5; id. Gram. 9: astrologiae, Col. 1, 1, 4; 11, 1, 12: juris civilis, Dig. 50, 13, 1.
    Absol.: opus etiam consummatis professoribus difficile, Quint. 1, 9, 3: circa scholas professorum, Suet. Tib. 11.
  2. II. Transf., in gen., a professor, teacher: veritatis, Amm 30, 5, 9; 22, 4, 1: adulandi professores jam docti, id. 17, 11, 1: non obscurus professor atque auctor, Quint. 2, 15, 36; cf. Plin. Ep. 4, 11, 2; Spart. Hadr 15; Dig. 50, 13, 6.
    Of a physician, Cels. 2, 6, 1; 6, 4; cf. Cod. 10, 52.