Wordnet 3.0
NOUN (1)
1. 
 a hypothetical subatomic particle of large mass that interacts weakly with ordinary matter through gravitation; 
 postulated as a constituent of the dark matter of the universe; 
[syn: weakly interacting massive particle, WIMP]
WordNet (r) 3.0 (2006):
weakly interacting massive particle
    n 1: a hypothetical subatomic particle of large mass that
         interacts weakly with ordinary matter through gravitation;
         postulated as a constituent of the dark matter of the
         universe [syn: weakly interacting massive particle,
         WIMP]