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Definition of antimatter noun from the Oxford Advanced Learner's Dictionary

antimatter

noun

/ˈæntimætə(r)/

/ˈæntimætər/,

/ˈæntaɪmætər/

[uncountable] (physics)

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matter that is made up of antiparticlesTopics Physics and chemistryc2

See antimatter in the Oxford Advanced American Dictionary

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noun

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A1

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