Usage History of 'silkworm'

The following chart shows how frequently 'silkworm' appeared in printed materials over time. For example, the word 'silkworm' occurred 2 times in books in 1670 and 15,711 times in 2008. From 1670 to 2008, the word 'silkworm' was used a total of 462,628 times in books scanned by Google. See Reference: Google Ngram project.

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