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单词 calculus
释义 calculus
 /kal"kyeuh leuhs/,  n.  ,  pl.   calculi /-luy'/, calculuses.
  1.  Math.   a method of calculation, esp. one of several highly systematic methods of treating problems by a special system of algebraic notations, as differential or integral calculus.
  2.  Pathol.   a stone, or concretion, formed in the gallbladder, kidneys, or other parts of the body.
  3. Also called tartar. Dentistry. a hard, yellowish to brownish-black deposit on teeth formed largely through the mineralization of dead bacteria in dental plaques by the calcium salts in salivary secretions and subgingival transudates.
  4. calculation: the calculus of political appeal.
 [1610-20; < L: pebble, small stone (used in reckoning), equiv. to calc- (s. of calx stone) + -ulus -ULE]
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