Pronunciation (UK) enPR: kăv'ən, IPA (key): /ˈkav.ən/ or /ˈkav.n̩/ (US) enPR: kăv'ərn, IPA (key): /ˈkæv.ɚn/ or /ˈkæv.rən/ Audio (UK)(file) Noun Singular cavern Plural caverns (countable) A cavern is a large cave. (countable) A cavern is an underground chamber.Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads