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rotor

[roh-ter] /ˈroʊ tər/
noun
1.
Electricity. a rotating member of a machine.
Compare stator (def 1).
2.
Aeronautics. a system of rotating airfoils, as the horizontal ones of a helicopter or of the compressor of a jet engine.
3.
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.
4.
(in a self-winding watch) a weight eccentrically mounted on an arbor for keeping the mainspring wound.
Origin
1873
1873; short for rotator
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for rotor-ship

rotor

/ˈrəʊtə/
noun
1.
the rotating member of a machine or device, esp the armature of a motor or generator or the rotating assembly of a turbine Compare stator
2.
a device having blades radiating from a central hub that is rotated to produce thrust to lift and propel a helicopter
3.
the revolving arm of the distributor of an internal-combustion engine
4.
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
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
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Word Origin and History for rotor-ship

rotor

n.

1873, irregular shortening of rotator (see rotate (v.)), originally in mathematics. Mechanical sense is attested from 1903; specifically of helicopters from 1930.

Online Etymology Dictionary, © 2010 Douglas Harper
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