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amplidyne

American  
[am-pli-dahyn] / ˈæm plɪˌdaɪn /

noun

Electricity.
  1. a direct-current generator with a rotating armature, capable of magnifying a small amount of power supplied to the field winding of the device and using the amplified power to operate an attached, direct-current motor.


Etymology

Origin of amplidyne

First recorded in 1935–40; ampli(fier) + dyne