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From The Collaborative International Dictionary of English v.0.48:
Singletree \Sin"gle*tree`\, n. [Cf. Swingletree.] The pivoted or swinging bar to which the traces of a harnessed horse are fixed; a whiffletree. [1913 Webster] Note: When two horses draw abreast, a singletree is fixed at each end of another crosspiece, called the doubletree. [1913 Webster]