residual volume n the volume of air still remaining in the lungs after the most forcible expiration possible and amounting usu. to 60 to 100 cubic inches (980 to 1640 cubic centimeters) called also residual air compare SUPPLEMENTAL AIR
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the volume of air that remains in the lungs after the individual has breathed out as much as he can. This volume is increased in emphysema.
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(RV) the amount of gas remaining in the lung at the end of a maximal exhalation. See illustration at capacity.Medical dictionary. 2011.