Usage History of 'pyorrheal'

The following chart shows how frequently 'pyorrheal' appeared in printed materials over time. For example, the word 'pyorrheal' occurred 2 times in books in 1897 and 8 times in 2007. From 1897 to 2007, the word 'pyorrheal' was used a total of 2,625 times in books scanned by Google. See Reference: Google Ngram project.

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