We found one dictionary that defines the word polyplethysmograph:

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1. polyplethysmograph: Wiktionary

Definitions from Wiktionary (polyplethysmograph) ▸ noun:  photoplethysmograph. ▸ Words similar to polyplethysmograph ▸ Usage examples for polyplethysmograph ▸ Idioms related to polyplethysmograph ▸ Wikipedia articles (New!) ▸ Popular adjectives describing polyplethysmograph ▸ Words that often appear near polyplethysmograph ▸ Rhymes of polyplethysmograph ▸ Invented words related to polyplethysmograph