Usage History of 'tetrahymena'

The following chart shows how frequently 'tetrahymena' appeared in printed materials over time. For example, the word 'tetrahymena' occurred 2 times in books in 1933 and 3,151 times in 2008. From 1933 to 2008, the word 'tetrahymena' was used a total of 154,558 times in books scanned by Google. See Reference: Google Ngram project.

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