Usage History of 'symbions'

The following chart shows how frequently 'symbions' appeared in printed materials over time. For example, the word 'symbions' occurred 2 times in books in 1895 and 18 times in 2007. From 1895 to 2007, the word 'symbions' was used a total of 297 times in books scanned by Google. See Reference: Google Ngram project.

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