To save this word, you'll need to log in.
non·bary·on·ic | \ ˌnän-ˌber-ē-ˈä-nik 
, -ˌba-rē- \
, -ˌba-rē- \Definition of nonbaryonic
: not being, relating to, or consisting of baryons : not baryonic
The only restriction on the identity of the dark matter is that it is nonbaryonic. In this context, that means mainly that the matter is not composed of neutrons or protons; it has to be some particle that does not take part in the structure of ordinary atoms and molecules.— Dietrick E. Thomsen
Keep scrolling for more
Comments on nonbaryonic
What made you want to look up nonbaryonic? Please tell us where you read or heard it (including the quote, if possible).
Test Your Vocabulary
More Confusing Words—Quiz
- The magician
______moved the selected card to the top of the deck.
Can you spell these 10 commonly misspelled words?
TAKE THE QUIZ
Test Your Knowledge - and learn some interesting things along the way.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridgedWords at Play
Ask the Editors
Word Games
- More Confusing Words—Quiz
How many of these commonly confused words do you know?
Take the quiz - Name that Thing: Toys and Games Edition
It's all fun and games until someone beats your high score.
Take the quiz - Spell It
Can you spell these 10 commonly misspelled words?
Take the quiz - Add Diction
Build a chain of words by adding one letter at a time.
Play the game
Share nonbaryonic
Time Traveler for nonbaryonic
The first known use of nonbaryonic was in 1982
See more words from the same year