Usage History of 'philtrum'

The following chart shows how frequently 'philtrum' appeared in printed materials over time. For example, the word 'philtrum' occurred 2 times in books in 1667 and 2,204 times in 2008. From 1667 to 2008, the word 'philtrum' was used a total of 43,241 times in books scanned by Google. See Reference: Google Ngram project.

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