noun
: a wave in which the particles of the medium move progressively in the direction of the wave propagation with such a gradation of speeds that the faster overtake the slower and are themselves in turn overtaken — compare standing wave
noun
: a wave in which the particles of the medium move progressively in the direction of the wave propagation with such a gradation of speeds that the faster overtake the slower and are themselves in turn overtaken — compare standing wave
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012