Usage History of 'calthrops'

The following chart shows how frequently 'calthrops' appeared in printed materials over time. For example, the word 'calthrops' occurred 2 times in books in 1656 and 121 times in 2008. From 1656 to 2008, the word 'calthrops' was used a total of 3,380 times in books scanned by Google. See Reference: Google Ngram project.

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