n. a device that connects two horses to a wagon or other implement. The tugs of a harness are connected to a singletree, two of which are connected to a doubletree, which, in turn, is connected to the implement.
the GNU version of the Collaborative International Dictionary of English
n. The bar, or crosspiece, of a carriage, to which the singletrees are attached.
The Century Dictionary and Cyclopedia
n. Same as equalizing-bar (which see, under bar).
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a crossbar on a wagon or carriage to which two whiffletrees are attached in order to harness two horses abreast
Word Usage
"A comfortable option is the DoubleTree Biltmore Hotel (115 Hendersonville Rd.; 828-274-1800; biltmorefarmshotels. com/doubletree; rooms from around $150 a night)."