Search Result for "quasiparticle": 
Wordnet 3.0

NOUN (1)

1. a quantum of energy (in a crystal lattice or other system) that has position and momentum and can in some respects be regarded as a particle; 



WordNet (r) 3.0 (2006):

quasiparticle
    n 1: a quantum of energy (in a crystal lattice or other system)
         that has position and momentum and can in some respects be
         regarded as a particle