Usage History of 'chirus'

The following chart shows how frequently 'chirus' appeared in printed materials over time. For example, the word 'chirus' occurred 2 times in books in 1779 and 90 times in 2008. From 1779 to 2008, the word 'chirus' was used a total of 3,132 times in books scanned by Google. See Reference: Google Ngram project.

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