Usage History of 'triphthong'

The following chart shows how frequently 'triphthong' appeared in printed materials over time. For example, the word 'triphthong' occurred 2 times in books in 1737 and 435 times in 2008. From 1737 to 2008, the word 'triphthong' was used a total of 7,725 times in books scanned by Google. See Reference: Google Ngram project.

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