Usage History of 'hydras'

The following chart shows how frequently 'hydras' appeared in printed materials over time. For example, the word 'hydras' occurred 4 times in books in 1587 and 2,447 times in 2008. From 1587 to 2008, the word 'hydras' was used a total of 68,242 times in books scanned by Google. See Reference: Google Ngram project.

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