Lewis & Short

Pictŏnes, um, m.,

  1. I. a people in Aquitanian Gaul, in the mod. Pays de Poiteau, Caes. B. G. 3, 11; Hirt. B. G. 8, 26; 27; Plin. 4, 19, 33, § 108; Luc. 1, 436.
    Hence,
  2. II. Pictŏnĭcus, a, um, adj., Pictonic: Pictonicum litus, Aus. Ep. 9, 36.