None. Plethysmography is a noninvasive diagnostic manometric study used to measure changes in the size of blood vessels by determining volume changes in the blood vessels of the eye, extremities, and neck or to measure gas volume changes in the lungs.
1. countable noun [usually with poss] A guardian is someone who has been legally appointed to look after the affairs of another person, for example a child or someone who is mentally ill. 2. countable noun. The guardian of something is someone who defends and protects it.
sage definition: The definition of sage is someone or something who is wise or exhibits signs of wisdom or intelligence. (adjective) An example of sage is the advice to always think before you act....