Usage History of 'ricin'

The following chart shows how frequently 'ricin' appeared in printed materials over time. For example, the word 'ricin' occurred 12 times in books in 1682 and 6,792 times in 2008. From 1682 to 2008, the word 'ricin' was used a total of 132,037 times in books scanned by Google. See Reference: Google Ngram project.

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