Lungs

lung   (lŭng)    n.   Either of two spongy, saclike respiratory organs in most vertebrates, occupying the chest cavity together with the heart and functioning to remove carbon dioxide from the blood and provide it with oxygen. A similar organ in some invertebrates, including spiders and terrestrial snails. [Middle English lunge, from Old English lungen, lungs; see legwh- in Indo-European roots.]

lungs

A pair of organs, the principal parts of the respiratory system, at the front of the cavity of the chest, or thorax. In the lungs, oxygen from the air that is inhaled is transferred into the blood, while carbon dioxide is removed from the blood and exhaled.

lung 

Main Entry: lung
Pronunciation: 'l&[ng]
Function: noun
1 a : one of the usually two compound saccular organs that constitute the basic respiratoryorgan 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 withthin-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 baseresting against the diaphragm and have the right lung divided into three lobes and the left into two lobes b : any of various respiratory organs of invertebrates
2 : a mechanical device for regularly introducing fresh air into and withdrawing stale air from the lungs : RESPIRATOR —see IRON LUNG —lunged adjective

lung (lŭng)
n.
Either of the two saclike organs of respiration that occupy the pulmonary cavity of the thorax and in which aeration of the blood takes place. It is common for the right lung, which is divided into three lobes, to be slightly larger than the left, which has two lobes.