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Related to whiffletree: whippletree
n. Northeastern US
[Variant of whippletree.]
(Horse Training, Riding & Manège) another name (esp US) for swingletree
[C19: variant of whippletree]
whif•fle•tree(ˈʰwɪf əlˌtri, ˈwɪf-)
Northern U.S. a crossbar, pivoted at the middle, to which the traces of a harness are fastened for pulling a vehicle or a plow. Also called whippletree , singletree.
[1820–30; variant of whippletree]