Definitions
a double sulphate of aluminum and potassium that is used as an astringent (among other things)
Word origin
From Middle English alum, alum, alym, alyme, from Anglo-Norman alum, alun, from Latin alūmen.
Used in a sentence
“Venice also needed alum for trade, since it was the point of departure for overland transportation of alum to southern Germany and its cloth-manufacturing Free Cities.”
“A natural astringent and antiseptic, potassium alum was coveted for its medicinal and cosmetic properties.”
“For similar reasons, aluminium sulphate and alums are used in dyeing cloth.[…]Normally alums are soluble in water and insoluble in alcohols.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer2 curated clues
01“Former student”4 letters
02“School graduate”4 letters
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