Pronunciation enPR: ăsʹtrənôt' (UK) IPA (key): /ˈæstrəˌnɔːt/ (US) IPA (key): /ˈæstrəˌnɔt/ or /ˈæʃtrəˌnɔt/ (Canada) IPA (key): /ˈæstrəˌnɒt/ Audio (CA)(file) Noun Singular astronaut Plural astronauts (countable) An astronaut is a person who travels into space. Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads