MORDACIOUS Meaning of MORDACIOUS in English [ mɔ:'deɪʃəs ]■ adjective formal1》 bitingly sarcastic or abusive. 2》 given to biting.Derivativesmordacity noun OriginC17: from L. mordax , mordac- 'biting' + -ious . Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004