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

A team of physicists is now claiming the first direct observation of the long-sought Breit-Wheeler process, in which two particles of light, or photons, crash into one another and produce an electron and its antimatter counterpart, a positron.

From Science News

From this spinning stellar husk, a “wind” of electrons and their antimatter partners blows outwards at a respectable percentage of the speed of light.

From Popular-Science

To get closer to the answer, we have studied a process where matter transforms into antimatter and vice versa.

From Singularity Hub 

For instance, electrons have antimatter twins called positrons.

From Science News For Students

Then they compared that with the reconstructed digital images of the transparencies, creating a new, antimatter picture they called a “compensation image.”

From The Daily Beast

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