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amplidyne

noun
am·​pli·​dyne | \ˈampləˌdīn\
plural -s

Definition of amplidyne 

: a direct-current generator that by the use of compensating coils and a short circuit across two of its brushes precisely controls a large power output whenever a small power input is varied in the field winding of the generator

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First Known Use of amplidyne

1940, in the meaning defined above

History and Etymology for amplidyne

amplifier + -dyne (from Greek dynamis power)

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The first known use of amplidyne was in 1940

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