ricin richweed • ricine · · · Info · Definitions · Synonyms · Characters · · ricin · · Text Latin · · Script 5 · · Length Definitions · · · (noun) a toxic protein extracted from castor beans; used as a chemical reagent; can be used as a bioweapon. Synonyms: ricin toxin. Example: "One milligram of ricin can kill an adult." · · Noun Definition 1 Synonyms · · · ricin toxin · · Synonym 1 Characters · · c latin small letter c U+0063 i latin small letter i U+0069 n latin small letter n U+006E r latin small letter r U+0072