Definition of Air sac

1. Noun. A tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways.

Exact synonyms: Air Cell, Alveolus
Group relationships: Lung
Generic synonyms: Sac
Derivative terms: Alveolate

2. Noun. Any of the thin-walled extensions of the tracheae of insects.
Group relationships: Insect
Generic synonyms: Sac

3. Noun. Any of the membranous air-filled extensions of the lungs of birds.
Group relationships: Bird
Generic synonyms: Sac

Medical Definition of Air sac

1. Thin-walled sacs or spaces which function as a part of the respiratory system in birds, fishes, insects, and mammals. The sacs are filled with air and connected with the air passages of the lungs; an air cell. Source: Websters Dictionary (04 Jul 1999)

Air Sac Pictures

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Lexicographical Neighbors of Air Sac

air pumps
air purifier
air quality maintenance area
air quote
air quotes
air rage
air raid
air raid siren
air raids
air reconnaissance
air resistance
air ride
air rifle
air rifles
air rights
air sac (current term)
air scooter
air scooters
air search radar
air shaft
air shed
air sheds
air ship
air ships
air show
air shower
air shows
air sick
air sickness
air sign

Literary usage of Air sac

Below you will find example usage of this term as found in modern and/or classical literature:

1. A Text-book of Zoology by Thomas Jeffery Parker, William Aitcheson Haswell (1921)
"The lungs with the aponeurosis or pleura p ib.l aperture of anterior thoracic air-sac; br. principal V 5' r , y 1 ? uP-h posterior end of the trachea, ..."

2. The Development of the Chick: An Introduction to Embryology by Frank Rattray Lillie (1908)
"just beneath the peritoneum. clavicular air-sac, o, Anterior thoracic _° 1, ... 4, Posterior thoracic air-sac, to expand into the abdominal 5, ..."

3. Respiration by John Scott Haldane (1922)
"Hence the extra proportion of CO2 extracted from the blood in the air-passage alveoli is practically taken from the air-sac alveoli, and this is why the ..."

4. The Scientific Memoirs of Thomas Henry Huxley by Thomas Henry Huxley, Michael Foster (1902)
"Hence the air-sac in front of the anterior intermediate in Apteryx must be the homologue ... air-sac does not extend beyond the front margin of the sternum, ..."

5. Comparative Anatomy of Vertebrates by Robert Wiedersheim (1907)
"The posterior thoracic air-sac presents the simplest and most constant relations, and never communicates with any of the neighbouring chambers, ..."

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