Usage History of 'pyriform'

The following chart shows how frequently 'pyriform' appeared in printed materials over time. For example, the word 'pyriform' occurred 2 times in books in 1734 and 4,614 times in 2008. From 1734 to 2008, the word 'pyriform' was used a total of 229,889 times in books scanned by Google. See Reference: Google Ngram project.

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