also: こうし
Technical term for the stony waste matter separated from metals during smelting or refining. Often replaced by the loanword スラグ in modern contexts.
See also: スラグ
A large amount of slag is produced at the steelworks.
Slag is sometimes reused as a raw material for cement.
Standard kanji form for the reading こうさい.
Alternate reading; less common than こうさい.
Compound of 鉱 (ore, mineral) and 滓 (dregs, sediment). The reading こうさい is the standard on'yomi combination; こうし is a less common variant.