Neptune

noun

Nep·​tune ˈnep-ˌtün How to pronounce Neptune (audio)
-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 adjective

Examples of Neptune in a Sentence

sailors shipwrecked by the wild waves of Neptune
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Villanova coach Kyle Neptune credited Reed’s physicality and UConn’s all-around defense for the second half effort that ended the game on a 27-6 run. Joe Arruda, Hartford Courant, 19 Feb. 2025 Planets the size of Neptune are conspicuously absent on orbits shorter than about three days. Dakotah Tyler, Scientific American, 18 Feb. 2025 The solar system’s 293 moons include several believed to harbor oceans, including Saturn’s Enceladus, Jupiter’s Europa, and Neptune’s Triton. Jeffrey Kluger, TIME, 18 Feb. 2025 Clear its orbit of other debris Pluto fails the third criterion because its orbit overlaps with objects in the Kuiper Belt, a region of icy bodies beyond Neptune. John Loeffler, Space.com, 18 Feb. 2025 See all Example Sentences for Neptune 

Word History

Etymology

Latin Neptunus

First Known Use

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

Time Traveler
The first known use of Neptune was before the 12th century

Dictionary Entries Near Neptune

Cite this Entry

“Neptune.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Neptune. Accessed 22 Feb. 2025.

Kids Definition

Neptune

noun
Nep·​tune ˈnep-ˌt(y)ün How to pronounce Neptune (audio)
: the planet eighth in order from the sun see planet
Neptunian adjective

More from Merriam-Webster on Neptune

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!