Lewis & Short

3. Lā̆tro, ōnis, m.,

  1. I. a Roman surname. So M. Porcius Latro, a famous orator from Spain, a friend of the elder Seneca, Sen. Contr. 1 praef.; Quint. 10, 5, 18; 9, 2, 91; Plin. 20, 14, 57, § 160.
    Hence,
  2. II. Lătrō-nĭānus, a, um, adj., of or belonging to Latro, Latronian: color, Sen. Contr. 1, 7, 16; 1 praef. § 13.