Main Entry: Nep·tune

Pronunciation: \ˈnep-ˌtün, -ˌtyün\

Function: noun

Etymology: Latin Neptunus

Date: 14th century

1 a : the Roman god of the sea — compare poseidon b : ocean
2 : the planet eighth in order from the sun — see planet table

— Nep·tu·ni·an \nep-ˈtü-nē-ən, -ˈtyü-\ adjective