Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Tarrăco or Tarracon, ōnis, f., a town in Spain, now Tarragona, Plin. 3, 3, 4, § 21; Cic. Balb. 11, 28; Liv. 22, 22.
Hence, Tarrăcōnensis, e, adj., of or belonging to Tarraco, Tarraconian: conventus, Liv. 26, 19: colonia, Tac. A. 1, 78: Hispania, Plin. 3, 1, 2, § 6; cf. provincia, id. 3, 1, 3, § 9: vinum, id. 14, 6, 8, § 71.