IN EXTREMIS Meaning of IN EXTREMIS in English [ ˌɪn ɛk'stri:mɪs ]■ adverb1》 in an extremely difficult situation. 2》 at the point of death.OriginL., from in 'in' + extremis , ablative plural of extremus 'outermost'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004