Definition of ricin in English:


Line breaks: ricin
Pronunciation: /ˈrʌɪsɪn
, ˈrɪsɪn


[mass noun] Chemistry
A highly toxic protein obtained from the pressed seeds of the castor oil plant.
More example sentences
  • There was a previous radiation study of ricin, a dimeric molecule linked by a single disulfide bridge.
  • Signs and symptoms of ricin poisoning depend on whether a person inhales or ingests ricin.
  • Studies have been performed on ricin as a possible anticancer agent.


late 19th century: from modern Latin Ricinus communis (denoting the castor oil plant) + -in1.

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