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antigen
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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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