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roche alum

[rohch] /roʊtʃ/
noun, Chemistry.
1.
an alumlike substance derived from alunite.
Origin of roche alum
late Middle English
1400-1450
1400-50; roche cliff, rocky height (now obsolete), late Middle English (see rock1); apparently partial translation of Middle French alum en roque, alun de roche
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Based on the Random House Dictionary, © Random House, Inc. 2018.
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