Usage History of 'calyptra'

The following chart shows how frequently 'calyptra' appeared in printed materials over time. For example, the word 'calyptra' occurred 1 time in books in 1631 and 491 times in 2008. From 1631 to 2008, the word 'calyptra' was used a total of 33,774 times in books scanned by Google. See Reference: Google Ngram project.

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