Usage History of 'heterocyclic'

The following chart shows how frequently 'heterocyclic' appeared in printed materials over time. For example, the word 'heterocyclic' occurred 8 times in books in 1893 and 5,275 times in 2008. From 1893 to 2008, the word 'heterocyclic' was used a total of 249,308 times in books scanned by Google. See Reference: Google Ngram project.

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