What is "therma"

Therma or Thermē (, ) was a Greek city founded by Eretrians or Corinthians in late 7th century BC in ancient Mygdonia (which was later incorporated into Macedon), situated at the northeastern extremity of a great gulf of the Aegean Sea, the Thermaic Gulf. The city was built amidst mosquito-infested swampland, and its name derives from the Greek thérmē/thérma, "( malarial) fever". Therma was later renamed Thessalonica by Cassander. By that time the port of the previous capital of Macedonia, Pella, had begun silting up, so Cassander took advantage of the deep-water port to the northwest of Therma to expand the settlement.