Usage History of 'blowholes'

The following chart shows how frequently 'blowholes' appeared in printed materials over time. For example, the word 'blowholes' occurred 4 times in books in 1809 and 1,633 times in 2008. From 1809 to 2008, the word 'blowholes' was used a total of 58,481 times in books scanned by Google. See Reference: Google Ngram project.

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