Webster's Revised Unabridged Dictionary · 1913

Yodel

Yodel , verb, transitive and intransitive

[German jodeln.]

To sing in a manner common among the Swiss and Tyrolese mountaineers, by suddenly changing from the head voice, or falsetto, to the chest voice, and the contrary; to warble.

Also: Yodle

Yodel , noun

A song sung by yodeling, as by the Swiss mountaineers.

Also: Yodle