(n.) The act of undulating; a waving motion or vibration; as, the undulations of a fluid, of water, or of air; the undulations of sound.
UNDULATION
Meaning of UNDULATION in English
Webster's English dictionary. Английский словарь Webster. 2012
(n.) The act of undulating; a waving motion or vibration; as, the undulations of a fluid, of water, or of air; the undulations of sound.
Webster's English dictionary. Английский словарь Webster. 2012