Usage History of 'cissoid'

The following chart shows how frequently 'cissoid' appeared in printed materials over time. For example, the word 'cissoid' occurred 8 times in books in 1735 and 207 times in 2008. From 1735 to 2008, the word 'cissoid' was used a total of 7,614 times in books scanned by Google. See Reference: Google Ngram project.

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