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

Adding to the initial confusion is a T-square led by Neptune in Pisces, forming a square between the sun in Sagittarius and the moon in Gemini. —Valerie Mesa, People.com, 14 Dec. 2024

Guests staying in Neptune and Pinnacle suites can dine in Club Orange, a more intimate dining room with a menu that largely matches what’s served in the main dining room. —David Swanson, Travel + Leisure, 14 Dec. 2024

Since the start of the program, Hubble has watched several swirling storms drift through the atmosphere of Neptune, a planet with a whopping 40-year seasons. —Sam Walters, Discover Magazine, 12 Dec. 2024

That means only the five planets outside Earth’s orbit—Mars, Jupiter, Saturn, Uranus and Neptune—can be at opposition from our perspective. —Carlyn Kranking, Smithsonian Magazine, 5 Dec. 2024

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