The equivalent of an additional circuit or wire, in reality not existing, obtained by certain arrangements of real circuits, as in some multiplex telegraph systems. [Webster 1913 Suppl.]

and circuit, borscht circuit, borsht circuit, bridge circuit, circuit, circuit board, circuit breaker, circuit card, circuit court of appeals, closed circuit, computer circuit, control circuit, electric circuit, electrical circuit, feedback circuit, integrated circuit, light circuit, lighting circuit, nand circuit, negative feedback circuit, open circuit, or circuit, parallel circuit, phantom, phantom limb, phantom limb pain, phantom limb syndrome, phantom orchid, printed circuit, pulse timing circuit, racing circuit, resonant circuit, series circuit, short circuit, shunt circuit, squelch circuit, tank circuit, telephone circuit, x-or circuit, xor circuit