RICIN Meaning of RICIN in English transcription, транскрипция: [ ˈrī-s ə n, ˈri- ]nounEtymology: Latin ricinus castor-oil plant Date: 1896: a poisonous protein in the castor bean Merriam-Webster's Collegiate English vocabulary. Энциклопедический словарь английского языка Merriam Webster. 2003