Usage History of 'spiracle'

The following chart shows how frequently 'spiracle' appeared in printed materials over time. For example, the word 'spiracle' occurred 2 times in books in 1729 and 2,545 times in 2008. From 1729 to 2008, the word 'spiracle' was used a total of 134,657 times in books scanned by Google. See Reference: Google Ngram project.

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