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

ricin

noun

/ˈraɪsɪn/

/ˈraɪsɪn/

[uncountable]

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a very poisonous substance obtained from the seeds of the castor oil plant
Word Originlate 19th cent.: from modern Latin Ricinus communis (denoting the castor oil plant) + -in.

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noun

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