Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Joppē or Jŏpē, ēs, f. [Ἰόπη], Joppa, a seaport of Palestine, now Jaffa, Plin. 5, 13, 14, § 68.
Hence, Joppĭcus, a, um, adj., of Joppa, Plin. 5, 14, 15, § 70.