Usage History of 'tortoise'

The following chart shows how frequently 'tortoise' appeared in printed materials over time. For example, the word 'tortoise' occurred 2 times in books in 1524 and 69,036 times in 2008. From 1524 to 2008, the word 'tortoise' was used a total of 1,657,418 times in books scanned by Google. See Reference: Google Ngram project.

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