(~s)
A ~ is an instrument which is used to discover that something is present somewhere, or to measure how much of something there is.
...a metal ~.
...fire alarms and smoke ~s.
N-COUNT: oft n N
(~s)
A ~ is an instrument which is used to discover that something is present somewhere, or to measure how much of something there is.
...a metal ~.
...fire alarms and smoke ~s.
N-COUNT: oft n N
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012