One of the mysteries of the English language finally explained.
1historical A glassy form of alum produced especially by evaporating an aqueous solution (now historical).
2A kind of glass containing alumina.
Late Middle English. Compare Anglo-Norman alum de glace, alun de glas, Middle French alun de glace, lit. ‘ice alum’ and also Anglo-Norman alomglas; compare further (after French) Middle Dutch aluun van glaetse.
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