Usage History of 'purpuras'

The following chart shows how frequently 'purpuras' appeared in printed materials over time. For example, the word 'purpuras' occurred 2 times in books in 1640 and 201 times in 2008. From 1640 to 2008, the word 'purpuras' was used a total of 16,233 times in books scanned by Google. See Reference: Google Ngram project.

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