Usage History of 'spirogyras'

The following chart shows how frequently 'spirogyras' appeared in printed materials over time. For example, the word 'spirogyras' occurred 4 times in books in 1881 and 6 times in 2007. From 1881 to 2007, the word 'spirogyras' was used a total of 229 times in books scanned by Google. See Reference: Google Ngram project.

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