(~s)
A ~ is a ring of muscle that surrounds an opening to the body and that can tighten to close this opening. (TECHNICAL)
...the anal ~.
N-COUNT
(~s)
A ~ is a ring of muscle that surrounds an opening to the body and that can tighten to close this opening. (TECHNICAL)
...the anal ~.
N-COUNT
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012