From Longman Dictionary of Contemporary Englishscuba divingscu‧ba div‧ing /ˈskuːbə ˌdaɪvɪŋ/ noun [uncountable] DSSthe sport of swimming under water while breathing through a tube that is connected to a container of air on your back —scuba diver noun [countable]
Examples from the Corpus
scuba diving• All watersports, with the exception of scuba diving and deep sea fishing are complimentary to guests of the hotel.• As well as soaking up the sun, Emma says she's particularly looking forward to scuba diving and swimming in Stingray City.Origin scuba diving (1900-2000) self-contained underwater breathing apparatus 