Usage History of 'spirilla'

The following chart shows how frequently 'spirilla' appeared in printed materials over time. For example, the word 'spirilla' occurred 2 times in books in 1800 and 1,802 times in 2008. From 1800 to 2008, the word 'spirilla' was used a total of 84,093 times in books scanned by Google. See Reference: Google Ngram project.

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