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cycasin
[ sahy-kuh-sin ]
/ ˈsaɪ kə sɪn /
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noun
a naturally occurring toxic glucoside, C8H16N2O7, obtained from the seeds of cycad plants, carcinogenic in humans and other mammals.
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Which of the following nouns has an irregular plural form?
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Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022