rotor blade

English Thesaurus

1. the long airfoil that rotates to provide the lift that supports a helicopter in the air (noun.artifact)

hypernym	:	aerofoil, airfoil, control surface, surface,
definition	:	a device that provides reactive force when in motion relative to the surrounding air; can lift or control a plane in flight (noun.artifact)

part meronym	:	main rotor,
definition	:	rotor consisting of large rotating airfoils on a single-rotor helicopter that produce the lift to support the helicopter in the air (noun.artifact)