quasiparticle

 
Pronunciation: /ˌkweɪzʌɪˈpaːtɪk(ə)l, ˌkweɪsʌɪ-, ˈkwɑːzi/

noun

Physics
  • a quantum of energy in a crystal lattice or other system of bodies which has momentum and position and can in some respects be regarded as a particle.