WordReference Random House Learner's Dictionary of American English © 2015
lung /lʌŋ/USA pronunciation n. [countable]

    Anatomyeither of the two saclike organs used for breathing in the chest of humans and air-breathing animals.


Collins Concise English Dictionary © HarperCollins Publishers::

lung /lʌŋ/ n
  1. either one of a pair of spongy saclike respiratory organs within the thorax of higher vertebrates, which oxygenate the blood and remove its carbon dioxide
  2. at the top of one's lungsin one's loudest voice; yelling
Etymology: Old English lungen; related to Old High German lungun lung. Compare lights²



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