STOMATITIS Meaning of STOMATITIS in English [ ˌstəʊmə'tʌɪtɪs , ˌstɒ- ]■ noun Medicine inflammation of the mucous membrane of the mouth.OriginC19: from Gk stoma 'mouth' + -itis . Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004