Usage History of 'epistasy'

The following chart shows how frequently 'epistasy' appeared in printed materials over time. For example, the word 'epistasy' occurred 4 times in books in 1909 and 10 times in 2008. From 1909 to 2008, the word 'epistasy' was used a total of 592 times in books scanned by Google. See Reference: Google Ngram project.

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