Usage History of 'planarian'

The following chart shows how frequently 'planarian' appeared in printed materials over time. For example, the word 'planarian' occurred 2 times in books in 1836 and 1,310 times in 2008. From 1836 to 2008, the word 'planarian' was used a total of 55,564 times in books scanned by Google. See Reference: Google Ngram project.

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