DIASTEREOISOMER Meaning of DIASTEREOISOMER in English [ ˌdʌɪəstɛrɪəʊ'ʌɪsəmə ]■ noun Chemistry each of a pair of stereoisomeric compounds that are not mirror images of one another.Derivatives~ic adjective Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004