Webster's English Dictionary

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lung

lung \'l*n\ n [ME lunge, fr. OE lungen; akin to OHG lungun lung, li-h]ti 
   light in weight - more at LIGHT 1a: one of the usu. paired compound 
   saccular thoracic organs that constitut e the basic respiratory organ of 
   air-breathing vertebrates 1b: any of various respiratory organs of 
   invertebrates  2a: a device enabling individuals abandoning a submarine to 
   rise to the sur face 2b: a mechanical device for regularly introducing 
   fresh air into and withdr awing stale air from the lung : RESPIRATOR