Usage History of 'superoxide'

The following chart shows how frequently 'superoxide' appeared in printed materials over time. For example, the word 'superoxide' occurred 4 times in books in 1814 and 22,580 times in 2008. From 1814 to 2008, the word 'superoxide' was used a total of 619,741 times in books scanned by Google. See Reference: Google Ngram project.

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