Usage History of 'opisthobranch'

The following chart shows how frequently 'opisthobranch' appeared in printed materials over time. For example, the word 'opisthobranch' occurred 4 times in books in 1877 and 338 times in 2008. From 1877 to 2008, the word 'opisthobranch' was used a total of 13,415 times in books scanned by Google. See Reference: Google Ngram project.

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