Usage History of 'ctenophore'

The following chart shows how frequently 'ctenophore' appeared in printed materials over time. For example, the word 'ctenophore' occurred 6 times in books in 1859 and 512 times in 2008. From 1859 to 2008, the word 'ctenophore' was used a total of 23,569 times in books scanned by Google. See Reference: Google Ngram project.

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