1. Also called wheeler . a horse, or one of the horses, harnessed behind others and nearest the front wheels of a vehicle.
2. Chiefly South Atlantic States. the left-hand horse of a pair hitched to a wagon or plow.
3. Chiefly South Midland and Southern U.S. a reliable, diligent, and strong worker.
Also, wheel-horse .
[ 1700-10 ]