Definitions for "Plethysmograph"
An instrument for determining and registering the variations in the size or volume of a limb, as the arm or leg, and hence the variations in the amount of blood in the limb.
An instrument for determining and registering variations in the amount of blood present or passing through an organ.
a measuring instrument for measuring changes in volume of a part or organ or whole body (usually resulting from fluctuations in the amount of blood it contains)
A device used to measure physiological sexual arousal in the male.
an instrument that measures physiological arousal