torque converter

noun Machinery.
a fluid coupling in which three or more rotors are used, one of which can be checked so that output torque is augmented and output speed diminished.

1925–30 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
torque converter
Also called: hydraulic coupling a hydraulic device for the smooth transmission of power in which an engine-driven impeller transmits its momentum to a fluid held in a sealed container, which in turn drives a rotor

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
The sole transmission is a six-speed automatic with a new torque converter, up
  from the current five-speed.
Typically, transmissions with electronic transmission control, have more than
  one set of torque converter lockup preconditions.
Change all fluids such as engine, transmission, torque converter transfer case
  and other differentials.
For automatic transmissions, the input and output speed of the torque converter
  turbine can be used to infer crankshaft torque.
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