Usage History of 'zooid'

The following chart shows how frequently 'zooid' appeared in printed materials over time. For example, the word 'zooid' occurred 6 times in books in 1785 and 541 times in 2008. From 1785 to 2008, the word 'zooid' was used a total of 58,632 times in books scanned by Google. See Reference: Google Ngram project.

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