split ring

noun

Definition of split ring

1 :a metal ring which consists of two complete turns of a helix pressed flat together and upon which objects (such as keys) may be strung
2 :a primitive form of commutator for a dynamo or motor consisting of a simple ring or cylindrical shell split axially with the parts insulated from each other
3 :a metal ring used often along with bolts as a timber connector in heavy construction

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