noun ·Rare ·Advanced level

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

Synonyms

All synonyms

alumpotassium alum

Etymology

From potash + alum.