Plethysmograph

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Plethysmograph \Pleth"ys*mo*graph\, n. [Gr. ? an enlargement +
     -graph.] (Physiol.)
     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.
     [1913 Webster] -- {Pleth`ys*mo*graph"ic}, a.


     [1913 Webster]

From WordNet (r) 2.0 [wn]:

  plethysmograph
       n : 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)