noun
[ U ] ( symb CaCO 3 ) ( chemistry ) a white solid substance that exists naturally as chalk , limestone and marble
noun
[ U ] ( symb CaCO 3 ) ( chemistry ) a white solid substance that exists naturally as chalk , limestone and marble
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005