Definition of: yodel

(yōd′l) noun
A melody or refrain sung to meaningless syllables, with abrupt changes from chest to head tones and the reverse: common among Swiss and Tirolese mountaineers.
—v.t. & v.i. ·deled or ·delled, ·del·ing or ·del·ling To sing with a yodel, changing the voice quickly from its natural tone to a falsetto and back. Also yo′dle. [<G jodeln, lit., utter the syllable jo]
—yo′del·er, yo′del·ler, yo′dler noun