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roche alum

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roche alum

[rohch]
–noun Chemistry.
an alumlike substance derived from alunite.

Origin:
1400–50; roche cliff, rocky height (now obs.), late ME (see rock 1 ); appar. partial trans. of MF alum en roque, alun de roche
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Based on the Random House Dictionary, © Random House, Inc. 2009.
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