plethysmograph

/pləˌθɪzməˈgræf/

Definitions of plethysmograph

1. noun

   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)
   types:

   body plethysmograph

   plethysmograph consisting of a chamber surrounding the entire body; used in studies of respiration

   digital plethysmograph

   plethysmograph applied to a digit of the hand or foot to measure skin blood flow

   type of:

   measuring device, measuring instrument, measuring system

   instrument that shows the extent or amount or quantity or degree of something