Noun
(physics) A wave that is not bounded by a given space, but can propagate freely.
Antonym: standing wave
(physics) A wave in which the vibration is in the direction of propagation; a longitudinal wave.
Antonym: transverse wave
These reflect subthreshold membrane potentials and strongly modulate the spiking of hippocampal neurons and synchronise across the hippocampus in a travelling wave pattern. Source: Internet
Though rarely depicted the travelling wave solutions can be viewed as rotating banded tori, with the bands representing phase information. Source: Internet