This page is a spellcheck for word extraterestrial. All Which is Correct spellings and definitions, including "Extraterestrial or extraterrestrial" are based on official English dictionaries, which means you can browse our website with confidence! Common searches that lead to this page: how to spell extraterestrial, correct spelling of extraterestrial, how is extraterestrial spelled, spell check extraterestrial, how do you spell extraterestrial.