Usage History of 'choroid'

The following chart shows how frequently 'choroid' appeared in printed materials over time. For example, the word 'choroid' occurred 4 times in books in 1738 and 19,009 times in 2008. From 1738 to 2008, the word 'choroid' was used a total of 965,654 times in books scanned by Google. See Reference: Google Ngram project.

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