soliton wave
       n : (physics) a quantum of energy or quasiparticle that can be
           propagated as a traveling wave in nonlinear systems and
           is neither preceded nor followed by another such
           disturbance; does not obey the superposition principle
           and does not dissipate; "soliton waves can travel long
           distances with little loss of energy or structure" [syn:
           soliton, solitary wave]