Usage History of 'glowworm'

The following chart shows how frequently 'glowworm' appeared in printed materials over time. For example, the word 'glowworm' occurred 2 times in books in 1658 and 2,791 times in 2008. From 1658 to 2008, the word 'glowworm' was used a total of 53,678 times in books scanned by Google. See Reference: Google Ngram project.

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