Found 2 items, similar to Antimatter.
English → English (WordNet) Definition: antimatter antimatter n : matter consisting of elementary particles that are the antiparticles of those making up normal matter
English → English (gcide) Definition: antimatter antimatter \an`ti*mat"ter\ ([a^]n`t[i^]*m[a^]t"t[~e]r), n. (Physics) Matter whch is composed of antiparticles such as antiprotons, positrons, and antineutrons. [PJC]