Antimatter

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  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]



From WordNet (r) 2.0 [wn]:

  antimatter
       n : matter consisting of elementary particles that are the
           antiparticles of those making up normal matter