bronco

[ brong-koh ]
/ ˈbrɒŋ koʊ /

noun, plural bron·cos.

a range pony or mustang of the western U.S., especially one that is not broken or is imperfectly broken.
Also bronc, broncho.

Origin of bronco

1865–70, Americanism; < Mexican Spanish, short for Spanish potro bronco untamed colt (in Mexican Spanish: wild horse, half-tamed horse); bronco, apparently nasalized variant of Latin broccus; see broach
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for bronco

British Dictionary definitions for bronco

bronco

broncho

/ (ˈbrɒŋkəʊ) /

noun plural -cos or -chos

(in the US and Canada) a wild or partially tamed pony or mustang of the western plains

Word Origin for bronco

C19: from Mexican Spanish, short for Spanish potro bronco unbroken colt, probably from Latin broccus projecting (as knots on wood), hence, rough, wild
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012