rotor

[ roh-ter ]
/ ˈroʊ tər /
|

noun

Electricity. a rotating member of a machine.Compare stator(def 1).
Aeronautics. a system of rotating airfoils, as the horizontal ones of a helicopter or of the compressor of a jet engine.
any of a number of tall, cylindrical devices mounted on a special ship (rotor ship) and rotated in such a way that the Magnus effect of wind impinging on the cylinders is used to drive and maneuver the vessel.
(in a self-winding watch) a weight eccentrically mounted on an arbor for keeping the mainspring wound.

Origin of rotor

First recorded in 1873; short for rotator
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for rotor

British Dictionary definitions for rotor

rotor

/ (ˈrəʊtə) /

noun

the rotating member of a machine or device, esp the armature of a motor or generator or the rotating assembly of a turbineCompare stator
a device having blades radiating from a central hub that is rotated to produce thrust to lift and propel a helicopter
the revolving arm of the distributor of an internal-combustion engine
a violent rolling wave of air occurring in the lee of a mountain or hill, in which the air rotates about a horizontal axis

Word Origin for rotor

C20: shortened form of rotator
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012