phason
/ˈfeɪzɒn/Physics
noun
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.