quasiparticles

/K W AA1 S IY0 P AA1 R T AH0 K AH0 L Z/
noun
  1. 1

    Any entity that has some characteristics of a distinct particle, but comprises a grouping of multiple particles

Source: https://en.wiktionary.org/wiki/quasiparticle, https://en.wiktionary.org/wiki/quasiparticles