Neptunian

[nep-too-nee-uhn, -tyoo-]

adjective

1. pertaining to Neptune or the sea.

2. pertaining to the planet Neptune.

3. (often lowercase),  formed by the action of water.

Neptunian

/ nɛpˈtjuːnɪən /

adjective

1. of or relating to the Roman god Neptune or the sea

2. of, occurring on, or relating to the planet Neptune

3. geology (of sedimentary rock formations such as dykes) formed under water

Other Word Forms

• trans-Neptunian adjective

Word History and Origins

Origin of Neptunian¹

First recorded in 1650–60; Neptune + -ian

Example Sentences

Dr. Hammel also thinks a glimpse of Hippocampus, an eighth Neptunian moon, is pictured just above the planet.

Read more on New York Times

There are four main types of exoplanets: Neptunian, gas giant, super-Earth and terrestrial.

Read more on Salon

I, ever a Neptunian, would haunt it, too.”

Read more on Seattle Times

This will be the first appearance of the women’s 1,500-meter freestyle in the Olympics, but Neptunian American Katie Ledecky has all 10 of the 10 fastest times in history, so it’s about as close as the IOC can get to simply giving an athlete a bonus gold medal.

Read more on Slate

The Neptunian Desert is an area of space near a star where no planets that are similar in size and scope to Neptune had been previously found.

Read more on Fox News

Related Words

• aquatic 
• coastal 
• deep-sea 
• maritime 
• naval 
• saltwater 
• seagoing