Short for bronchial or bronco, sometimes used informally in medical contexts to refer to airways or in historical contexts as slang for a wild horse.
Combining form from Greek bronchos (windpipe), used as a prefix in many respiratory terms. The 'bronco' spelling (wild horse) comes from Spanish bronco meaning 'rough' or 'wild'.
In medical terminology, 'broncho-' became one of the most productive prefixes, spawning dozens of medical terms—but in American slang and regional usage, 'bronco' refers to untamed horses, showing how the same root can diverge into completely different meanings across contexts.
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