antimatter

noun

an·​ti·​mat·​ter ˈan-tē-ˌma-tər  ˈan-ˌtī- 

: matter composed of antiparticles

Examples of antimatter in a Sentence

Recent Examples on the Web

At higher energies, more mesons (pairs of quarks and their antimatter counterparts, antiquarks) are present. — Clara Moskowitz, Scientific American, 28 Sep. 2026

What happens when the invisible string connecting two fundamental particles—a quark and its antimatter counterpart, an antiquark—is stretched so far that new particles can begin to form? — Rupendra Brahambhatt, Interesting Engineering, 27 Sep. 2026

The main way that happens is by colliding electrons and their antimatter partners, positrons. — Matt Von Hippel, Quanta Magazine, 29 July 2026

This is akin to what happens when an electron meets its antimatter counterpart, or positron. — Robert Lea, Space.com, 21 June 2026

Word History

First Known Use

1934, in the meaning defined above

Rhymes for antimatter

• atter
• batter
• blatter
• catarrh
• chatter
• clatter
• fatter
• flatter
• hatter
• latter
• matter
• natter

Kids Definition

antimatter

noun

an·​ti·​mat·​ter ˈant-i-ˌmat-ər 

: matter whose parts match parts of ordinary matter except in having some opposite properties (as a positive instead of a negative charge)