- 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.
lung definition by Webster's New World
- 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: Middle 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
lung definition by American Heritage Dictionary
- Either of two spongy, saclike respiratory organs in most vertebrates, occupying the chest cavity together with the heart and functioning to remove carbon dioxide from the blood and provide it with oxygen.
- A similar organ in some invertebrates, including spiders and terrestrial snails.
Origin: Middle English lunge, from Old English lungen, lungs; see legwh- in Indo-European roots.
lung - Medical Definition
Top: right and left lungs
Bottom: detail showing terminal respiratory units of bronchial tree
lung - Phrases/Idioms
at the top of one's lungs
at the top of (one's) lungs
lung - Science Definition
- Either of two spongy organs in the chest of air-breathing vertebrate animals that serve as the organs of gas exchange. Blood flowing through the lungs picks up oxygen from inhaled air and releases carbon dioxide, which is exhaled. Air enters and leaves the lungs through the bronchial tubes.
- A similar organ found in some invertebrates.