Lewis & Short

Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.

‡ 1. issus, a, um, adj., a childish form of ipse, used with little children as a term of endearment: ISSA HAVE, Inscr. ap. Fabr. p. 45, n. 255.
Issa, the name of a pet slut, Mart. 1, 109.
Also dim.: ‡ issŭlus, a, um, Inscr. ap. Fabr. n. 254.

2. Issus or -os, i, f., = Ἰσσός,

  1. I. a city of Cilicia, on the Mediterranean (the Gulf of Issus, now Gulf of Iskenderun), at the foot of Mount Amanus, where Darius was defeated by Alexander, Mel. 1, 13, 1; Plin. 5, 27, 22, § 91; Cic. Fam. 2, 10, 3; Curt. 3, 8, 8.
  2. II. Deriv. Issĭcus, a, um, adj., of or belonging to Issus: sinus, the Gulf of Issus, Mel. 1, 13, 1; Plin. 2, 108, 112, § 243.