Rhe″o‐chord (?), n. [Gr. ρεἱ̑ν to flow + ��� chord.] (Elec.) A metallic wire used for regulating the resistance of a circuit, or varying the strength of an electric current, by inserting a greater or less length of it in the circuit.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.