antimatter

American  

[an-tee-mat-er, an-tahy-] / ˈæn tiˌmæt ər, ˈæn taɪ- /

noun

Physics.

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

---

antimatter British  

/ ˈæntɪˌmætə /

noun

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

---

antimatter Scientific  

/ ăn′tĭ-măt′ər /

1. A form of matter that consists of antiparticles.

---

antimatter Cultural  

1. In physics, matter made of antiparticles.

---

Etymology

Origin of antimatter

First recorded in 1950–55; anti- + matter

Example Sentences

These very massive, elusive particles then decayed into lighter, more stable particles with a slight preference for matter over antimatter.

From Science Daily

Such simulations could shed light on major open questions in physics, including the imbalance of matter and antimatter, the creation of heavy elements inside supernovae, and the behavior of matter at ultra-high densities.

From Science Daily

Understanding a process called neutrino oscillation, where these particles change "flavors" as they move, could help explain why matter triumphed over antimatter.

From Science Daily

According to current understanding, the early universe should have contained nearly equal amounts of matter and antimatter.

From Science Daily

When the Universe was created two kinds of particles were created: matter – from which stars, planets and everything around us are made – and, in equal amounts, antimatter, matter's exact opposite.

From BBC