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Collins

colcothar

  

      n   a finely powdered form of ferric oxide produced by heating ferric sulphate and used as a pigment and as jewellers' rouge,   (Also called)    crocus  
     (C17: from French colcotar, from Spanish colcótar, from Arabic dialect qulqutar)  
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Consulter aussi:

collator, colorant, Colo, Colt

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