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/plɛˈðɪz.məˌɡɹæf/ · noun
(medicine) An instrument for measuring changes in volume within an organ or whole body (usually via fluctuations in the amount of fluid it contains)..
Use plethysmograph when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Plethysmograph means (medicine) An instrument for measuring changes in volume within an organ or whole body (usually via fluctuations in the amount of fluid it contains)..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use plethysmograph where its definition matches the intended context.
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