A marble temple of the Ionic order built on the Acropolis in Athens c.421–406 BC, with shrines to Athene, Poseidon, and Erechtheus, a legendary king of Athens.
Definition of Erechtheum in US English:
Erechtheum
proper nouniˈrikTHēəm
A marble temple of the Ionic order built on the Acropolis in Athens c.421–406 BC, with shrines to Athena, Poseidon, and Erechtheus, a legendary king of Athens. It is most famous for its southern portico, in which the entablature is supported by six caryatids.