ple·thys·mo·graph (pl -th z m -gr f , pl-)n. An instrument that measures variations in the size of an organ or body part on the basis of the amount of blood passing through or present in the part. [Greek pl  thusmos, increase (from plth nein, to increase, from plths, quantity, from plthein, to be full; see pel-1 in Indo-European roots) + -graph.]ple·thys mo·graphic adj.ple·thys mo·graphi·cal·ly adv.pleth ys·mogra·phy (plthz-m gr-f) n. |
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