adjective Electricity.
having more than one phase.
of or pertaining to a set of alternating currents that have the same frequency but different phases and that enter a specified region at more than two points.

1890–95; poly- + phase

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World English Dictionary
polyphase (ˈpɒlɪˌfeɪz)
1.  single-phase two-phase See also three-phase Also: multiphase (of an electrical system, circuit, or device) having, generating, or using two or more alternating voltages of the same frequency, the phases of which are cyclically displaced by fractions of a period
2.  having more than one phase

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Example sentences
Most exposures show complex microstructures suggestive of polyphase deformation and superimposed shearing.
Polyphase sulfide deposition characterizes the deposit.
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