Potash alum

noun

Definitions

Noun
  1. 1
    alum, hydrated potassium aluminium sulphate, formula K₂SO₄.Al₂(SO₄)₃.24H₂O uncountable
  2. 2
    a white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum wordnet

Etymology

From potash + alum.

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