[brong-koh] 
| a range pony or mustang of the western U.S., esp. one that is not broken or is imperfectly broken. |
| bron·co (brŏng'kō) n. pl. bron·cos An untrained or partially trained horse or pony of western North America. [American Spanish, from Spanish, wild, perhaps from Vulgar Latin *bruncus, knot in a tree, perhaps from Latin broccus, projecting (influenced by truncus, stump).] |
bronco
North American wild or Indian-tamed horse, descended from horses taken to the New World by the Spanish in the 16th century. The name comes from that of an Indian tribe of eastern Washington and Oregon that was known for the small horses it bred.
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