Clinker is a waste product that forms on the crucible beneath a metal forge. It is composed of coke and other impurities which form in the process of iron making. 80 more words
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Clinker – the stony residue from burnt coal or from a furnace; a brick with a vitrified surface; a mass of incombustible matter fused together; the scale of oxide formed on iron during forging; a mass of vitrified material ejected from a volcano; a wrong note in a musical performance; a conspicuous failure; a product of inferior quality; someone or something wonderful or exceedingly well-liked; something admirable or first-rate.