from The American Heritage® Dictionary of the English Language, 4th Edition
- n. See whiffletree.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A bar behind draft animals and in front of a load, such as a wagon, that balances the load. Generally the animals are attached at the ends and the wagon or other load to a pivot in the middle of the singletree.
from the GNU version of the Collaborative International Dictionary of English
- n. The pivoted or swinging bar to which the traces of a harnessed horse are fixed; a whiffletree.
from The Century Dictionary and Cyclopedia
- n. Same as swingletree.
Alteration (influenced by doubletree) of swingletree.(American Heritage® Dictionary of the English Language, Fourth Edition)