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Changing the pitch and volume of one's voice.
(botany, of a margin) Winding up and down gradually relative to the blade.
From Late Latin undula small wave diminutive of Latin unda wave wed-1 in Indo-European roots
American Heritage Dictionary of the English Language, 5th Edition
From Late Latin undulātus (“undulated"), from *undula (“small wave"), diminutive of Latin unda (“wave").
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