Definition of piebald adjective from the Oxford Advanced Learner's Dictionary

 

piebald

 adjective
adjective
BrE BrE//ˈpaɪbɔːld//
 
; NAmE NAmE//ˈpaɪbɔːld//
 
 
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(of a horse) with areas on it of two colours, usually black and white compare skewbald Word Origin late 16th cent.: from pie used in the naming of birds (because of the magpie's black-and-white plumage) + bald (in the obsolete sense ‘streaked with white’).
See the Oxford Advanced American Dictionary entry: piebald