The Simple English Wikipedia has an article on: Tuba Pronunciation (US) IPA (key): /ˈtuːbə/ (UK) IPA (key): /ˈtjuːbə/ Noun Singular tuba Plural tubas (countable) (music) A tuba is a large brass musical instrument. It has a very low sound. This young boy plays the tuba very nicely.Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads