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air sac
noun
1
: one of the air-filled spaces in the body of a bird connected with the air passages of the lungs
3
: a thin-walled dilation of a trachea occurring in many insects
Examples of air sac in a Sentence
Recent Examples on the Web
Most people have either emphysema, which happens when air sacs in the lungs called alveoli don’t function properly, or chronic bronchitis — which happens when inflammation in the airways causes mucus to accumulate in the lungs.
—Lisa Rapaport, EverydayHealth.com, 27 Sep. 2024
Pneumonia is inflammation of the small air sacs deep in the lungs, called alveoli.
—Kathi Valeii, Verywell Health, 4 July 2024
In addition, damaged air sacs lose their ability to stretch and shrink back.
—Kathi Valeii, Verywell Health, 4 July 2024
Her primary focus was on hyaline membrane disease, sometimes called respiratory distress syndrome, in which alveoli — tiny air sacs in the lungs — do not properly inflate.
—Matt Schudel, Washington Post, 3 July 2024
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Word History
First Known Use
circa 1805, in the meaning defined at sense 1
Dictionary Entries Near air sac
Cite this Entry
“Air sac.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/air%20sac. Accessed 2 Dec. 2024.
Kids Definition
air sac
noun1
: one of the air-filled spaces connected with the lungs of a bird
2
: one of the thin-walled microscopic pouches in which gases are exchanged in the lungs
Medical Definition
air sac
nounMore from Merriam-Webster on air sac
Britannica.com: Encyclopedia article about air sac
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