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Medical Dictionary

lung

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noun \ˈləŋ\

Medical Definition of lung

  1. 1a:  one of the usually two compound saccular organs that constitute the basic respiratory organ of air-breathing vertebrates, that normally occupy the entire lateral parts of the thorax and consist essentially of an inverted tree of intricately branched bronchioles communicating with thin-walled terminal alveoli swathed in a network of delicate capillaries where the actual gaseous exchange of respiration takes place, and that in humans are somewhat flattened with a broad base resting against the diaphragm and have the right lung divided into three lobes and the left into two lobesb:  any of various respiratory organs of invertebrates

  2. 2:  a mechanical device for regularly introducing fresh air into and withdrawing stale air from the lungs :  respirator—see iron lung

  3. lunged adjective



Illustration of lung



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