Neptune

noun

Nep·​tune ˈnep-ˌtün 

-ˌtyün

1

a

: the Roman god of the sea compare poseidon

b

: ocean

2

: the planet eighth in order from the sun see Planets Table

Neptunian

nep-ˈtü-nē-ən 

-ˈtyü-

adjective

Synonyms

• sea
• ocean

Examples of Neptune in a Sentence

sailors shipwrecked by the wild waves of Neptune

Recent Examples on the Web

Coogler originally wanted Williams to play a role in Black Panther, but Williams was at work co-directing a science fiction musical, Neptune Frost which premiered at Cannes. —Nia Shumake, Essence, 15 May 2025

Event Horizon tells the chilling supernatural tale of a rescue vessel investigating a missing spaceship that reappears near Neptune after a seven-year absence. —Jeff Spry, Space.com, 12 May 2025

Gomez said the first phase would add the roundabout, bike lanes and street parking on Broadway from Stewart to Neptune Road. —Natalia Jaramillo, The Orlando Sentinel, 12 May 2025

Two years ago, New Jersey health officials warned that two products sold as dietary supplements in gas stations and online – Neptune’s Elixir and ZaZa Red – had caused a spike in illnesses. —Greg Wehner, FOXNews.com, 12 May 2025

Word History

Etymology

Latin Neptunus

First Known Use

before the 12th century, in the meaning defined at sense 1a

Kids Definition

Neptune

noun

Nep·​tune ˈnep-ˌt(y)ün 

: the planet eighth in order from the sun see planet

Neptunian

nep-ˈt(y)ü-nē-ən 

adjective