Bible Encyclopedias
Bronco

1911 Encyclopedia Britannica

usually incorrectly spelt Broncho (a Spanish word meaning rough, rude), an unbroken or untamed horse, especially in the United States, a mustang; the word entered America by way of Mexico.

Bibliography Information
Chisholm, Hugh, General Editor. Entry for 'Bronco'. 1911 Encyclopedia Britanica. https://www.studylight.org/​encyclopedias/​eng/​bri/​b/bronco.html. 1910.