Usage History of 'pronephric'

The following chart shows how frequently 'pronephric' appeared in printed materials over time. For example, the word 'pronephric' occurred 8 times in books in 1795 and 418 times in 2008. From 1795 to 2008, the word 'pronephric' was used a total of 40,399 times in books scanned by Google. See Reference: Google Ngram project.

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