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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).]
n, pl -cos or -chos
(Animals) (in the US and Canada) a wild or partially tamed pony or mustang of the western plains
[C19: from Mexican Spanish, short for Spanish potro bronco unbroken colt, probably from Latin broccus projecting (as knots on wood), hence, rough, wild]
n., pl. bron•cos also broncs.
a range pony or mustang of the western U.S., esp. one that is not broken or is imperfectly broken.
[1865–70, Amer.; < Mexican Spanish, short for Sp potro bronco untamed colt (in Mexican Spanish: wild horse, half-tamed horse)]
bronco- Spanish for "rough, rude."
See also related terms for rude.