Usage History of 'zoos'

The following chart shows how frequently 'zoos' appeared in printed materials over time. For example, the word 'zoos' occurred 2 times in books in 1667 and 19,965 times in 2008. From 1667 to 2008, the word 'zoos' was used a total of 470,388 times in books scanned by Google. See Reference: Google Ngram project.

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