Usage History of 'siphonophore'

The following chart shows how frequently 'siphonophore' appeared in printed materials over time. For example, the word 'siphonophore' occurred 3 times in books in 1860 and 148 times in 2008. From 1860 to 2008, the word 'siphonophore' was used a total of 9,476 times in books scanned by Google. See Reference: Google Ngram project.

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