- The definition of a lung is a sponge like organ used for breathing that is found in the chest cavity in humans and animals.
An example of a lung is the organ that puts oxygen in the blood and removes carbon dioxide.
An image of human lungs.
- either of the two spongelike respiratory organs in the thorax of 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 *lengʷʰ- (“not heavy, agile, nimble”); cf. *h₁lengʷʰ-, whence ultimately also light. Cognate with West Frisian long, Dutch long, German Lunge, Danish lunge, Swedish lunga, Icelandic lunga, and also Russian лёгкое (lёgkoe) (lung), Ancient Greek ἐλαφρός (ἐlafrós) and perhaps Albanian lungë (“blister, bulge”). Compare Latin levis and Old English lēoht (Modern English light). See also lights ("lungs").