Lewis & Short

Frentāni, ōrum, m.,

  1. I. a mixed Italian tribe of Samnites and Illyrians who settled in Samnium, on the Adriatic Sea, in the south-eastern part of what is now the Abruzzo Citra, Caes. B. C. 1, 23 fin.; Cic. Clu. 69, 197; Liv. 9, 16; 45 fin.; Plin. 3, 5, 6, § 38.
    Sing.: Frentanus, as collect., Sil. 15, 567.
  2. II. Deriv.: Frentānus, a, um, adj., of or belonging to the Frentani: ager, Liv. 27, 43: regio, Plin. 3, 11, 16, § 103.