[rahy-sin, ris-in]
noun Chemistry.
a white, poisonous, protein powder from the bean of the castor-oil plant.

1895–1900; < Neo-Latin Ricinus name of genus, Latin: castor-oil plant

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World English Dictionary
ricin (ˈraɪsɪn, ˈrɪs-)
biochem a highly toxic protein, a lectin, derived from castor-oil seeds: used in experimental cancer therapy
[C19: from New Latin Ricinus genus name, from Latin: castor-oil plant]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

poison obtained from the castor-oil bean, 1896, from ricinus, genus name of the castor-oil plant (1694), from L. ricinus (Pliny), perhaps the same word as ricinus "tick (in sheep, dogs, etc.).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

ricin ri·cin (rī'sĭn, rĭs'ĭn)
A poisonous protein that is extracted from the castor bean and is used as a biochemical reagent.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
ricin   (rī'sĭn, rĭs'ĭn)  Pronunciation Key 
An extremely poisonous protein extracted from the castor bean. Ricin inhibits protein synthesis in cells, and is used as a biochemical reagent and in cancer research.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
They quickly developed a shoebox-sized prototype capable of detecting toxins, including ricin and anthrax.
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