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calc-tufa

資料來源 : Webster's Revised Unabridged Dictionary (1913)

Calc-tufa \Calc"-tu`fa\, n. [G. kalk (l. calx) lime + E. tufa.]
   See under {Calcite}.

資料來源 : WordNet®

calc-tufa
     n : a soft porous rock consisting of calcium carbonate deposited
         from springs rich in lime [syn: {tufa}]
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