Usage History of 'zonulas'

The following chart shows how frequently 'zonulas' appeared in printed materials over time. For example, the word 'zonulas' occurred 2 times in books in 1868 and 8 times in 2007. From 1868 to 2007, the word 'zonulas' was used a total of 212 times in books scanned by Google. See Reference: Google Ngram project.

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