Gypsum is a soft white substance which looks like chalk and which is used to make plaster of Paris.
N-UNCOUNT
Gypsum is a soft white substance which looks like chalk and which is used to make plaster of Paris.
N-UNCOUNT
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012