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

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

Matter is so dominant in our universe that any antimatter typically encounters matter quickly and annihilates. —Quanta Magazine, 15 June 2026

In medical imaging, devices such as positron emission tomography scanners, or PET scanners for short, detect radiation produced when particles of antimatter – positrons – annihilate with electrons, which are normal matter. —Christopher Karwin, The Conversation, 8 June 2026

Last year two teams independently published real-time quantum simulations of the creation of matter and antimatter during a process called string breaking. —Zeeya Merali, Scientific American, 19 May 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)