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fluid drive

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noun Automotive.
  1. a power coupling for permitting a smooth start in any gear, consisting of two vaned rotors in a sealed casing filled with oil, such that one rotor, driven by the engine, moves the oil to drive the other rotor, which in turn drives the transmission.
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Origin of fluid drive

First recorded in 1940–45
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for fluid drive

fluid drive

noun
  1. a type of coupling for transmitting power from the engine of a motor vehicle to the transmission, using a torque converterAlso called: fluid coupling, fluid clutch, fluid flywheel
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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