antimatter

[ an-tee-mat-er, an-tahy- ]

noun

, Physics.

1. matter composed only of antiparticles, especially antiprotons, antineutrons, and positrons.

antimatter

/ ˈæntɪˌmætə /

noun

1. a form of matter composed of antiparticles, such as antihydrogen, consisting of antiprotons and positrons

antimatter

/ ăn′tĭ-măt′ər /

1. A form of matter that consists of antiparticles.

antimatter

1. In physics , matter made of antiparticles .

Word History and Origins

Origin of antimatter¹

First recorded in 1950–55; anti- + matter

Example Sentences

Instead, dark matter is its own antimatter, so any pair of particles that meet will destroy each other.

From The Daily Beast

The distribution was unequal of course; antimatter could not exist in contact with ordinary matter.

From Project Gutenberg

On the average, one atom out of every ten million in the universe was an atom of antimatter.

From Project Gutenberg