Bible Dictionaries
Roche Alum
Webster's Dictionary
A kind of alum occuring in small fragments; - so called from Rocca, in Syria, whence alum is said to have been obtained; - also called rock alum.
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Bibliography Information
Webster, Noah. Entry for 'Roche Alum'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/r/roche-alum.html. 1828.