propellers is a form of:

Propeller



noun
1.
(person or thing that propels) ship propeller ស្លាបចក្រ airplane propeller ដង្ហាល់ (កង្ហារ)
ENGLISH MEANING
noun
1.
One who, or that which, propels.
2.
A contrivance for propelling a steam vessel, usually consisting of a screw placed in the stern under water, and made to revolve by an engine; a propeller wheel.
3.
A steamboat thus propelled; a screw steamer.
1.
A propeller screw placed in front of the supporting planes of an aeroplane instead of behind them, so that it exerts a pull instead of a push. Hence, Tractor monoplane, Tractor biplane, etc.