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cycasin

[sahy-kuh-sin] /ˈsaɪ kə sɪn/
noun
1.
a naturally occurring toxic glucoside, C 8 H 16 N 2 O 7 , obtained from the seeds of cycad plants, carcinogenic in humans and other mammals.
Origin
apparently cycas + -in2
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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