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Medical Definition of pneumatics. : a branch of mechanics that deals with the mechanical properties of gases.
Medical Definition of RESPIRATORY SYSTEM. : a system of organs functioning in respiration and consisting especially of the nose, nasal passages, nasopharynx, larynx, trachea, bronchi, and lungsâcalled also respiratory tract; see lower respiratory tract, upper respiratory tract. a system of organs functioning in respiration and in humans consisting especially of the nose, nasal passages, pharynx, larynx, trachea, bronchi, and lungs. See respiratory system defined for kids. ADVERTISEMENT.