Definition of phason in US English:

phason

noun

Physics
  • 1A formation of electrons localized within and stabilizing a region of a distinct phase within a non-metallic material. disused.

  • 2A quantum or quasiparticle associated with variation of the phase of movements of the lattice elements in a quasicrystalline lattice. Frequently attributive Compare "phonon".

Origin

1970s; earliest use found in Soviet Physics: Solid State. From phase + -on, originally after Russian fazon.

Pronunciation

phason

/ˈfeɪzɒn/