Definitions
1.NounA worker in any of several types of yard, as:
A worker in a railyard.
2.NounA worker in a railyard.
3.NounA farm worker assigned to the farmyard of a large farm, working at hostler duties (harnessing and hitching teams), loading and unloading wagons, feeding, and so on.
4.NounA laborer hired to do outdoor work.