• synonyms

side circuit

noun Electricity.
  1. See under phantom circuit.
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phantom circuit

noun Electricity.
  1. a circuit derived from two suitably arranged pairs of wires, each pair being a circuit (side circuit) and also acting as one half of an additional derived circuit, the entire system providing the capabilities of three circuits while requiring wires for only two.
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Origin of phantom circuit

First recorded in 1880–85
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018