fireclay

Noun
  1. A heat-resistant clay (synset 114838013)
    is a type of: clay - a very fine-grained soil that is plastic when moist but hard when fired
    substance meronym:
    • firebrick - brick made of fire clay; used for lining e.g. furnaces and chimneys
    • furnace lining, refractory - lining consisting of material with a high melting point; used to line the inside walls of a furnace

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