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antimatter
an·ti·mat·ter
[
ánti màttər,
ántī màttər
]
noun
Definition:
matter composed of antiparticles:
a hypothetical form of matter composed of subatomic particles
antiparticles
that correspond to and can annihilate other elementary particles
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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