Usage History of 'protozoon'

The following chart shows how frequently 'protozoon' appeared in printed materials over time. For example, the word 'protozoon' occurred 4 times in books in 1847 and 1,023 times in 2008. From 1847 to 2008, the word 'protozoon' was used a total of 58,016 times in books scanned by Google. See Reference: Google Ngram project.

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