from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An untrained or partially trained horse or pony of western North America.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A horse of western North America that is wild or not fully broken.
from the GNU version of the Collaborative International Dictionary of English
- n. Same as broncho.
from The Century Dictionary and Cyclopedia
- n. On the northwestern plains of the United States, an unbroken or imperfectly broken horse, usually a mustang or Indian pony.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. an unbroken or imperfectly broken mustang
American Spanish, from Spanish, wild, perhaps from Vulgar Latin *bruncus, knot in a tree, perhaps from Latin broccus, projecting (influenced by truncus, stump).(American Heritage® Dictionary of the English Language, Fourth Edition)
From Spanish bronco ("rough"). (Wiktionary)