Webster's English Dictionary

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calcareous

cal.car.e.ous \kal-'kar-e--*s, -'ker-\ aj [L calcarius of lime, fr. calc-, 
   calx lime] 1a: resembling calcite or calcium carbonate esp. in hardness  
   1b: consisting of or containing calcium carbonate; also : containi ng 
   calcium 2: growing on limestone or in soil impregnated with lime  - 
   cal.car.e.ous.ly av