(~s)
An ~ is a chemical substance that is found in living creatures which produces changes in other substances without being changed itself. (TECHNICAL)
N-COUNT
(~s)
An ~ is a chemical substance that is found in living creatures which produces changes in other substances without being changed itself. (TECHNICAL)
N-COUNT
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012