Usage History of 'birthworts'

The following chart shows how frequently 'birthworts' appeared in printed materials over time. For example, the word 'birthworts' occurred 2 times in books in 1741 and 36 times in 2008. From 1741 to 2008, the word 'birthworts' was used a total of 752 times in books scanned by Google. See Reference: Google Ngram project.

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