A very hard brick used for paving customarily made in the Netherlands.
A mass of bricks fused together by intense heat.
Slag or ash produced by intense heat in a furnace, kiln or boiler that forms a hard residue upon cooling.
An intermediate product in the manufacture of Portland cement, obtained by sintering limestone and alumino-silicate materials such as clay into nodules in a cement kiln.
Hardened volcanic lava.
A scum of oxide of iron formed in forging.
To convert or be converted into clinker.
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