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

• blue
• brine
• deep
• ocean
• sea
• seven seas

Examples of Neptune in a Sentence

sailors shipwrecked by the wild waves of Neptune

Recent Examples on the Web

With Neptune entering Aries on the 30th, your vision for the future is starting to expand. —Meghan Rose, Glamour, 1 Mar. 2025

Comments Welcome back to Neptune, Calif., the fictional SoCal town home to teen sleuth Veronica Mars (Kristen Bell) and its variety of mysteries — murderous and otherwise. —Sezin Koehler, EW.com, 1 Mar. 2025

Finally, Neptune’s ingress into Aries on March 30 marks the beginning of a pivotal shift that will influence us all for years to come. —Valerie Mesa, People.com, 1 Mar. 2025

Uranus and Neptune will be the most difficult to observe and will require a telescope or high-powered binoculars. —Jenna Dejong, Newsweek, 28 Feb. 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