Merriam-Webster Logo
SINCE 1828
Menu
dictionary thesaurus

trans-Neptunian

adjective
\¦tran(t)s, -raan-, -nz+\

Definition of trans-Neptunian 

: lying beyond the orbit of the planet Neptune

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

History and Etymology for trans-Neptunian

trans- + Neptune, formerly most distant known planet + English -ian

Keep scrolling for more

Learn More about trans-Neptunian

Share trans-Neptunian

Resources for trans-Neptunian

Cite Time Traveler Time Traveler! Explore the year a word first appeared

Dictionary Entries near trans-Neptunian

transnational

transnatural

transnature

trans-Neptunian

transocean

transoceanic

transom

Statistics for trans-Neptunian

Look-up Popularity

Comments on trans-Neptunian

What made you want to look up trans-Neptunian? Please tell us where you read or heard it (including the quote, if possible).

Show Comments  Hide Comments 

WORD OF THE DAY

mawkish

exaggeratedly or childishly emotional

Get Word of the Day daily email!

Test Your Vocabulary

Words from Greek and Roman Mythology Quiz

  • the-triumph-of-venus-by-alessandro-magnasco
  • Boreal comes from the name of the ancient Greek god of which wind?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
Add Diction

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

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

Words at Play

Ask the Editors

Word Games