doubletree

from WordNet (r) 3.0 (2006)
doubletree
    n 1: a crossbar on a wagon or carriage to which two whiffletrees
         are attached in order to harness two horses abreast
from The Collaborative International Dictionary of English v.0.48
Doubletree \Dou"ble*tree`\, n.
   The bar, or crosspiece, of a carriage, to which the
   singletrees are attached.
   [1913 Webster]
antiflux / dictionary / doubletree
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