polyphase

adjective
poly·​phase | \ˈpä-lē-ˌfāz \

Definition of polyphase 

: having or producing two or more phases a polyphase machine a polyphase current

First Known Use of polyphase

1891, in the meaning defined above

History and Etymology for polyphase

International Scientific Vocabulary

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Time Traveler for polyphase

The first known use of polyphase was in 1891

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