The term pied describes bird plumage that has large, contrasting patches of bold color, most often in black and white and with clear, distinct edges. While pied birds are typically black and white, the term may occasionally be used to describe any plumage colors that have similar large, bold patches of two or more colors in close to equal proportions.
Merriam-Webster Online Dictionary
pied (adjective) of two or more colors in blotches , also wearing or having a parti-colored coat - a pied horse