an·​ti·​mat·​ter | \ ˈan-tē-ˌma-tər How to pronounce antimatter (audio) , ˈan-ˌtī-\

Definition of antimatter

: matter composed of antiparticles

Examples of antimatter in a Sentence

Recent Examples on the Web

From a quantum perspective, the vacuum of space continually produces pairs of virtual particles (matter and antimatter) that pop into existence and just as quickly annihilate away. Jennifer Ouellette, Ars Technica, "Sonic black holes produce “Hawking radiation,” may confirm famous theory," 30 May 2019 And as perfect as Paros seems, in recent years its smaller satellite, Antiparos (the name is a little absurd, almost comical, like antimatter), has become still more fashionable, a haunt of American rock and movie stars. Adam Gopnik, Town & Country, "My First Visit to the Greek Islands Turned Out to Be a Journey Home," 20 May 2019 Physicists have long believed that the Big Bang produced equal amounts of matter and an identical but oppositely charged substance known as antimatter. NBC News, "This bold experiment aims to solve one of the biggest mysteries in science," 8 May 2018 The first stage will see the FCC collide electrons with positrons, the antimatter electron counterpart. Avery Thompson, Popular Mechanics, "Scientists Are Planning a New Particle Collider That Absolutely Dwarfs the LHC," 16 Jan. 2019 Even more exciting, the bright gamma-ray glow fit quite well to dark matter being annihilated into a pair of matter/antimatter quarks. Chris Lee, Ars Technica, "Gamma ray evidence for dark matter outshone by a flock of pulsars," 10 Aug. 2018 In very large stars, pressures at the core are thought eventually to produce antimatter, causing an explosion so violent that the star simply disintegrates without leaving any remnants at all. Davide Castelvecchi, Scientific American, "Here Come the Waves," 23 Apr. 2018 The antimatter should have annihilated all the regular matter, leaving nothing left over. Avery Thompson, Popular Mechanics, "New Experiment Hints at Why the Universe Is Made of Something Rather Than Nothing," 8 Aug. 2016 Gott suggests that highly efficient antimatter fuel could be the key and other world agencies and scientists also think such a fuel could be a potentially invaluable piece to interstellar travel. Matt Blitz, Popular Mechanics, "We Already Know How To Build a Time Machine," 28 May 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'antimatter.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of antimatter

1950, in the meaning defined above

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Last Updated

8 Jul 2019

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Time Traveler for antimatter

The first known use of antimatter was in 1950

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More from Merriam-Webster on antimatter

Rhyming Dictionary: Words that rhyme with antimatter Encyclopedia article about antimatter

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an act or instance of editing or removing

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