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1 definition found
 for Roche alum
From The Collaborative International Dictionary of English v.0.48 :

  Roche alum \Roche" al`um\ (Chem.)
     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.
     [1913 Webster]

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