slag

1) Refuse matter separated from the metal in the smelting process.

1721 all the waste of Lead ore or slagge, Buckden. The slag from former bole hills was evidently worth re-smelting and is referred to as slagwork or blackwork: 1427 antiquum slagwerk remanentem ex antiquo, Stanhope Park, co. Durham. A ‘slag hearth’ used for that purpose is mentioned in Derbyshire in 1572.

dates 1427 1572 1721

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