Usage History of 'ionium'

The following chart shows how frequently 'ionium' appeared in printed materials over time. For example, the word 'ionium' occurred 2 times in books in 1686 and 592 times in 2008. From 1686 to 2008, the word 'ionium' was used a total of 37,872 times in books scanned by Google. See Reference: Google Ngram project.

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