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earth

noun [C usually singular] (WIRE)
 
 
/ɜːθ/ US  /ɝːθ/ UK (US ground)

Definition

a wire that makes a connection between a piece of electrical equipment and the ground, so the user is protected from feeling an electric shock if the equipment develops a faultElectrical switches and connections
(Definition of earth noun (WIRE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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