gault

/ɡɔːlt/
noun
  1. A type of heavy, sticky clay soil, often found in southern England, used for making bricks and pottery.
    • The farmer struggled to plow the field due to the thick gault underneath.
    • Local brickmakers have used gault from this area for centuries.
    • The garden was difficult to dig because it was full of gault.
Synonyms
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