Where does “Θερμαῖος κόλπος” come from?

Θερμαῖος κόλπος (Ancient Greek) comes from Ancient Greek -αῖος, from Ancient Greek -ῐος, from Proto-Indo-European -yós — Creates adjectives from noun or verb stems.

Θερμαῖος κόλπος (Ancient Greek): the Thermaic Gulf; the Macedonian Gulf; the Gulf of Thessaloniki

Definitions

  1. the Thermaic Gulf; the Macedonian Gulf; the Gulf of Thessaloniki

Ancestry of “Θερμαῖος κόλπος”, step by step

StepLanguageWordMeaning
1Ancient Greek-αῖοςSuffix added to nouns or adjectives, forming adjectives: pertaining to, belonging to ("of")
2Ancient Greek-ῐοςbelonging to; of”, “belonging to”, “pertaining to
3Proto-Indo-European-yósCreates adjectives from noun or verb stems
Every word from Proto-Indo-European -yós →Every word from Ancient Greek -ῐος →Every word from Ancient Greek -αῖος →