| 1. | either of the two saclike respiratory organs in the thorax of humans and the higher vertebrates. |
| 2. | an analogous organ in certain invertebrates, as arachnids or terrestrial gastropods. |
| 3. | at the top of one's lungs, as loudly as possible; with full voice: The baby cried at the top of his lungs. |
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.
lung (lŭng) Pronunciation Key
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at the top of one's lungs
Also, at the top of one's voice. With an extremely loud voice. For example, The babies in the nursery all were crying at the top of their lungs. The noun top here refers to the greatest degree of volume (that is, loudest) rather than high pitch, a usage dating from the mid-1500s.