Usage History of 'airhole'

The following chart shows how frequently 'airhole' appeared in printed materials over time. For example, the word 'airhole' occurred 8 times in books in 1739 and 351 times in 2008. From 1739 to 2008, the word 'airhole' was used a total of 5,702 times in books scanned by Google. See Reference: Google Ngram project.

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