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antimatter

Noun

an=ti=mat=ter

WORDNET DICTIONARY

antimatter(n = noun.substance) Array - matter consisting of elementary particles that are the antiparticles of those making up normal substances; Array

antimatter, n.

Matter whch is composed of antiparticles such as antiprotons, positrons, and antineutrons. [PJC]

antimatter, n. Physics matter composed solely of antiparticles.

For further exploring for "antimatter" in Webster Dictionary Online