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lead

 
/led/ n [U] (METAL)

Definition

a dense, soft, dark gray metal, used esp. in combination with other metals and in batteries (= devices that produce electricity): Lead pipes in many older houses have been replaced by copper ones. fig. The day after running a marathon, my legs felt like lead (= heavy and tired).
(Definition of lead n (METAL) from the Cambridge Academic Content Dictionary © Cambridge University Press)

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