[ap-uh-loo-suh] 
| one of a hardy breed of riding horses, developed in the North American West, having a mottled hide, vertically striped hoofs, and eyes that show a relatively large proportion of white. |
| Ap·pa·loo·sa (āp'ə-lōō'sə) n. A breed of saddle horse developed in northwest North America, characteristically having a spotted rump. [Perhaps from alteration of Opelousas, city of southern Louisiana.] |