Also, Salonica [suh-lon-i-kuh, sal-uh-nee-kuh] /səˈlɒn ɪ kə, ˌsæl əˈni kə/ (Show IPA), Saloniki [Greek sah-law-nee-kee] /Greek ˌsɑ lɔˈni ki/ (Show IPA). Official name Thessalonike. Ancient Therma. a seaport in south-central Macedonia, in NE Greece, on the Gulf of Salonika.