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Noun limestone has 1 sense
  1. limestone - a sedimentary rock consisting mainly of calcium that was deposited by the remains of marine animals
    --1 is a kind of     rock, stone; sedimentary rock
    --1 has substances:
     calcium, Ca, atomic number 20; carbon, C, atomic number 6; calcite
     --1 has particulars: rottenstone, tripoli
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