ricin

Definitions of ricin
  1. noun
    a toxic protein extracted from castor beans; used as a chemical reagent; can be used as a bioweapon
    “one milligram of ricin can kill an adult”
    synonyms: ricin toxin
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    type of:
    albumen, albumin
    a simple water-soluble protein found in many animal tissues and liquids
    toxin
    a poisonous substance produced during the metabolism and growth of certain microorganisms and some higher plant and animal species
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