roche alum
[ rohch ]
nounChemistry.
an alumlike substance derived from alunite.
Origin of roche alum
11400–50; roche cliff, rocky height (now obsolete), late Middle English (see rock1); apparently partial translation of Middle French alum en roque, alun de roche
Words Nearby roche alum
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use roche alum in a sentence
Or, wash the brass-work with a strong solution of roche alum, and polish it with tripoli.
Mrs. Hale's Receipts for the Million | Sarah Josepha HaleIf one ounce of powdered roche-alum be put into a cask of four gallons of wine, it will make it fine and brisk in ten days.
Mrs. Hale's Receipts for the Million | Sarah Josepha HaleA strong lye of roche alum and water also improves the appearance of brass.
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