This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A horse with patchy markings of white and another color. Also called paint.

adj. Mottled; pied.

n. A horse with a patchy coloration that includes white.

adj. Pied, mottled.

adj. Lit., painted; hence, piebald; mottled; pied.

n. Any pied animal; esp., a pied or “painted” horse.

Piebald.

n. A piebald animal; specifically, the calico or painted pony of Texas.

n. A Portuguese gold coin of the eighteenth century, equal to 400 reis.

n. In the Philippine Islands, a door.

n. a spotted or calico horse or pony

"Jack called a pinto, but Russ said it was a calico pony."

equus caballus    horse   

American Paint Horse   

pinto bean   

mottled    pied   

Shinto   

piebald    roan    dapple-grey    spavined    riderless    grass-fed    dappled    haricot    eight-legged    square-rigger