An image of human lungs.
An example of a lung is the organ that puts oxygen in the blood and removes carbon dioxide.
- either of the two spongelike respiratory organs in the thorax of air-breathing vertebrates, that oxygenate the blood and remove carbon dioxide from it
- any analogous organ in invertebrates
Origin of lungMiddle English lunge ; from Old English lungen, akin to German lunge ; from Indo-European base an unverified form legwh-, light in weight and movement: the lungs were so named because of their lightness: see lights
at the top of one's lungs
- Either of two spongy, saclike respiratory organs in air-breathing vertebrates, occupying the chest cavity together with the heart and functioning to provide oxygen to the blood while removing carbon dioxide.
- A similar organ in some invertebrates, including spiders and terrestrial snails.
Origin of lungMiddle English lunge, from Old English lungen, lungs; see legwh- in Indo-European roots.
From Middle English, from Old English lungen, from Proto-Germanic *lungw- (“the light organ"), from Proto-Indo-European *lengÊ·Ê°- (“not heavy, agile, nimble"); cf. *hâ‚lengÊ·Ê°-, whence ultimately also light. Cognate with West Frisian long, Dutch long, German Lunge, Danish lunge, Swedish lunga, Icelandic lunga, and also Russian Ð»Ñ‘Ð³ÐºÐ¾Ðµ (lÑ‘gkoe) (lung), Ancient Greek á¼Î»Î±Ï†ÏÏŒÏ‚ (á¼lafrÃ³s) and perhaps Albanian lungÃ« (“blister, bulge"). Compare Latin levis and Old English lÄ“oht (Modern English light). See also lights ("lungs").