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Origin and history of ricin
ricin(n.)
poison obtained from the castor-oil bean, 1888, from ricinus, genus name of the castor-oil plant (1694), from Latin ricinus (Pliny), a word of uncertain origin, perhaps the same word as ricinus "tick" (in sheep, dogs, etc.). Latin ricinum was used in late Old English herbariums.
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Trends of ricin
adapted from books.google.com/ngrams/ with a 7-year moving average; ngrams are probably unreliable.
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