bi ‧ o ‧ feed ‧ back /ˌbaɪəʊˈfiːdbæk $ ˌbaɪoʊ-/ BrE AmE noun [uncountable]
a method of helping people to relax by teaching them to control their heart rate, breathing etc, using an instrument attached to the body
bi ‧ o ‧ feed ‧ back /ˌbaɪəʊˈfiːdbæk $ ˌbaɪoʊ-/ BrE AmE noun [uncountable]
a method of helping people to relax by teaching them to control their heart rate, breathing etc, using an instrument attached to the body
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012