Usage History of 'umbilicals'

The following chart shows how frequently 'umbilicals' appeared in printed materials over time. For example, the word 'umbilicals' occurred 2 times in books in 1717 and 309 times in 2008. From 1717 to 2008, the word 'umbilicals' was used a total of 9,110 times in books scanned by Google. See Reference: Google Ngram project.

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