Usage History of 'dipnoan'

The following chart shows how frequently 'dipnoan' appeared in printed materials over time. For example, the word 'dipnoan' occurred 2 times in books in 1866 and 86 times in 2008. From 1866 to 2008, the word 'dipnoan' was used a total of 9,336 times in books scanned by Google. See Reference: Google Ngram project.

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