What does Termera mean in Latin?

Termera, a proper noun, means “a maritime town in Caria situated on the southern coast of the peninsula of Halicarnassus”.

What is the genitive of Termera?

The genitive singular is Termerae. Termera is feminine, first declension.

proper noun · femininefirst declension

Termera f sg (genitive Termerae)

femininesingulara maritime town in Caria situated on the southern coast of the peninsula of Halicarnassus

Borrowed from Ancient Greek Τέρμερα (Térmera).