tractors is a form of:

Tractor



noun
1.
(a powerful motordriven vehicle for pulling farm machinery or other heavy equipment) ត្រាក់ទ័រ
ENGLISH MEANING
noun
1.
That which draws, or is used for drawing.
2.
Two small, pointed rods of metal, formerly used in the treatment called Perkinism.
3.
An aeroplane flying machine having one or more tractor screws.