Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

antimatter

play
noun an·ti·mat·ter \ˈan-tē-ˌma-tər, ˈan-ˌtī-\

Definition of antimatter

  1. :  matter composed of antiparticles



1950

First Known Use of antimatter

1950


Learn More about antimatter


Seen and Heard

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

WORD OF THE DAY

marked by grandiloquent style

Get Word of the Day daily email!