The Simple English Wikipedia has an article on: Submarine Pronunciation (UK) IPA (key): /sʌb.məˈriːn/ (US) IPA (key): /sʌb.məˈrin/ or /ˈsʌb.mə.rin/ Audio (UK)(file) Noun Singular submarine Plural submarines (countable) A submarine is a boat that can go underwater. This short entry needs someone to make it better. You can help Wiktionary by adding to it. Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads