probably borrowed from German Plethysmogramm, from plethysmo- (in Plethysmograph plethysmograph) + -gramm -gram
1894, in the meaning defined above
plethron
plethysmogram
plethysmograph
“Plethysmogram.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/plethysmogram. Accessed 30 Nov. 2024.
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