Meaning of “antimatter” in the English Dictionary

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"antimatter" in American English

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antimatternoun [ U ]

/ˈænt·iˌmæt̬·ər, ˈæn·tɑɪ-/

physics matter that consists of particles (= small parts of atoms) that have the opposite electrical characteristics of the particles in regular matter

(Definition of “antimatter” from the Cambridge Academic Content Dictionary © Cambridge University Press)