English

Definition of ricin noun from the Oxford Advanced Learner's Dictionary

 

ricin

 noun
noun
BrE BrE//ˈraɪsɪn//
 
; NAmE NAmE//ˈraɪsɪn//
 
[uncountable]
 
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a very poisonous substance obtained from the seeds of the castor oil plant Word Origin late 19th cent.: from modern Latin Ricinus communis (denoting the castor oil plant) + -in.
See the Oxford Advanced American Dictionary entry: ricin