Usage History of 'cardioid'

The following chart shows how frequently 'cardioid' appeared in printed materials over time. For example, the word 'cardioid' occurred 3 times in books in 1766 and 1,951 times in 2008. From 1766 to 2008, the word 'cardioid' was used a total of 59,666 times in books scanned by Google. See Reference: Google Ngram project.

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