(~s)
An ~ is a test of a substance to find out what chemicals it contains. It is usually carried out to find out how pure a substance is. (TECHNICAL)
N-COUNT
(~s)
An ~ is a test of a substance to find out what chemicals it contains. It is usually carried out to find out how pure a substance is. (TECHNICAL)
N-COUNT
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012