air sac

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air sac

1. An air-filled space in the body of a bird that forms a connection between the lungs and bone cavities and aids in breathing and temperature regulation.

2. See alveolus.

3. A saclike, thin-walled enlargement in the trachea of an insect.

4. An inflatable pouch attached to the larynx in certain mammals, including the nonhuman great apes.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

air sac

1. (Zoology) any of the membranous air-filled extensions of the lungs of birds, which increase the efficiency of gaseous exchange in the lungs

2. (Zoology) any of the thin-walled extensions of the tracheae of insects having a similar function

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

air′ sac`

1. alveolus (def. 2).

2. any of certain cavities in a bird's body connected with the lungs.

[1820–30]

air sac

1. An air-filled space in the body of a bird that forms a connection between the lungs and bone cavities. See alveolus.

2. A sac-like enlargement in the trachea of an insect.

3. A bag-like piece of skin or tissue below the jaw of certain animals, such as the bullfrog and orangutan, that can be inflated to increase sound production.

The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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Noun	1.	air sac - a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways air cell, alveolus lung - either of two saclike respiratory organs in the chest of vertebrates; serves to remove carbon dioxide and provide oxygen to the blood sac - a structure resembling a bag in an animal
	2.	air sac - any of the thin-walled extensions of the tracheae of insects insect - small air-breathing arthropod sac - a structure resembling a bag in an animal
	3.	air sac - any of the membranous air-filled extensions of the lungs of birds bird - warm-blooded egg-laying vertebrates characterized by feathers and forelimbs modified as wings sac - a structure resembling a bag in an animal

References in periodicals archive ?

Further endoscopic evaluation of the coelomic air sacs was not possible due to the length of time required for the tracheoscopy procedure and patient's condition.

What is your diagnosis?

In pneumonia, some of the tiny air sacs (alveoli) in the lungs become inflamed and filled with pus (dead white blood cells) and fluid.

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Air sacs bulging from a horse's hearing system may solve the mystery of how such an athletic animal cools its brain during exercise without the standard anatomical gadgetry, argues an international team of researchers.

Why don't racing horses fry their brains?

Case report 805: synovial sarcoma, epithelial hyperplasia in the humeral air sacs, and formation of medullary bone.

Synovial sarcoma associated with indwelling intramedullary pin in a peach-faced lovebird (Agapornis roseicollis)

Eventually, this dual onslaught turns the lung's air sacs into bloated cysts.

Cystic fibrosis puzzle coming together

Postmortem examination demonstrated multiple granulomas in the lungs and air sacs. The right coelom was filled with opaque fluid.

J Zoo Wildl Med.: Mycobacterium genavense in an African penguin (Spheniscus demersus)

The infection starts in the nose and throat, then spreads further down, causing bronchitis, until it reaches the tiny air sacs in the lower lungs.

Why we're all at risk of pneumonia; Dear Miriam

Also, the lungs' air sacs create a mosaic of gas-liquid boundaries that make MRI difficult, if not impossible, with water protons, says Arnold Wishnia, a biophysical chemist at Stony Brook.

Breathe (xenon) deeply to see lungs clearly

Adult trematodes that infect the respiratory system release eggs into the air sacs of the definitive avian host.

Detection and management of air sac trematodes (Szidatitrema species) in captive multispecies avian exhibits

It's a mass of fine tubes the smallest of which end in tiny air sacs called alveoli and there are 300 million of these.

Health Zone: Boost your lungs; We breathe without thinking but our lungs are under increasing threat.. asthma cases are rising and pulmonary diseases are now Britain's biggest killers. So give your body a breath of fresh air

Researchers had previously suggested that these sounds originate farther down in the head, near a set of nasal air sacs or even in the larynx.

Dolphin sonar: using their heads to click

Other samples such as conjunctiva, lungs, air sacs, heart, liver, spleen, and feces were negative for chlamydia by fluorescence antibody test in birds submitted over several weeks.

Avian Dis.: An unusual outbreak of chlamydiosis in commercial turkeys involving the nasal glands

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