Usage History of 'periodid'

The following chart shows how frequently 'periodid' appeared in printed materials over time. For example, the word 'periodid' occurred 1 time in books in 1894 and 2 times in 2007. From 1894 to 2007, the word 'periodid' was used a total of 67 times in books scanned by Google. See Reference: Google Ngram project.

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