Usage History of 'philtered'

The following chart shows how frequently 'philtered' appeared in printed materials over time. For example, the word 'philtered' occurred 1 time in books in 1774 and 8 times in 2008. From 1774 to 2008, the word 'philtered' was used a total of 223 times in books scanned by Google. See Reference: Google Ngram project.

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