noun
calcium carbonate (CaCO3)
Chemical compound; used in contexts such as limestone, chalk, antacids, and dietary supplements.
卵の殻は主に炭酸カルシウムでできている。
Eggshells are mainly made of calcium carbonate.
炭酸カルシウムは胃酸を中和するのに使われる
Calcium carbonate is used to neutralize stomach acid.