a. Lethean. [ Obs. ] Marston. [ 1913 Webster ]
n. [ Oxalic + ethyl + -ine. ] A poisonous nitrogenous base (
‖n. [ Gr. &unr_; 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 ]
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n. (Physiol.) The study, by means of the plethysmograph, of the variations in size of a limb, and hence of its blood supply. [ 1913 Webster ]