spellchecker Syllabification: (spell·check·er)Pronunciation: /ˈspelˌCHeker/Translate spellchecker | into French | into Italian | into Spanish Definition of spellchecker noun a computer program that checks the spelling of words in files of text, typically by comparison with a stored list of words. spellchecker in other Oxford dictionaries Definition of spellchecker in the British & World English dictionary