UN'DULATORY, adjective [from undulate. Moving in the manner of waves; or resembling the motion of waves, which successively rise or swell and fall. We speak of the undulatory motion of water, of air or other fluid, and this undulatory motion of air is supposed to be the cause of sounds. This is sometimes called vibratory; but undulatory seems to be most correct.
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Webster's Dictionary 1828
American Dictionary of the English Language, Noah Webster, 1828.