Lewis & Short

Istri (Histri), ōrum, m.,

  1. I. the inhabitants of Istria, the Istrians, Liv. 41, 11; Plin. 3, 19, 23, § 129.
  2. II. Derivv.
    1. A. Istrĭa (Hist-), a country of Italy, on the Adriatic Sea, and bordering on Illyria, Plin. 3, 19, 23, § 129; Liv. 39, 55.
    2. B. Istrĭ-āni (Hist-), ōrum, m., the inhabitants of Istria, Istrians, Juv. 9, 2, 1.
    3. C. Istrĭcus (Hist-), a, um, adj., of or belonging to Istria, Istrian: bellum, Liv. 41, 1; 41, 11: ostrea, Plin. 32, 6, 21, § 62.
    4. D. Istrus (Hist-), a, um, adj., Istrian: testa, i. e. Istrian oil in Istrian jars, Mart. 12, 63, 2.