Usage History of 'tracheolar'

The following chart shows how frequently 'tracheolar' appeared in printed materials over time. For example, the word 'tracheolar' occurred 9 times in books in 1904 and 104 times in 2008. From 1904 to 2008, the word 'tracheolar' was used a total of 2,878 times in books scanned by Google. See Reference: Google Ngram project.

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