alum /alˈəm/

1. Double sulphate of aluminium and potassium, with 24 molecules of water, crystallizing in transparent octahedra
2. Any similar compound of a trivalent metal (esp aluminium) and a univalent metal or radical

alˈumish adjective

Having the character or taste of alum

alˈum-root noun

An American plant of the saxifrage family with astringent root

alˈum-shale or alˈum-slate noun

A slate consisting mainly of clay, iron pyrites and coaly matter, from which alum is obtained

• lesser
• Lesser Bairam
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