Usage History of 'umbra'

The following chart shows how frequently 'umbra' appeared in printed materials over time. For example, the word 'umbra' occurred 2 times in books in 1574 and 7,255 times in 2008. From 1574 to 2008, the word 'umbra' was used a total of 242,459 times in books scanned by Google. See Reference: Google Ngram project.

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