Air sac — 1. (Anat.) One of the spaces in different parts of the bodies of birds, which are filled with air and connected with the air passages of the lungs; an air cell. [1913 Webster] 2. An {alveolus}. [PJC] … The Collaborative International Dictionary of English
Air sac — is an anatomical term with several meanings: * Pulmonary alveolus, informally known as an air sac, one of innumerable spherical outcroppings of the respiratory bronchioles in the mammalian lung, the secondary sites of gas exchange with the blood… … Wikipedia
air sac — n ALVEOLUS (b) * * * 1. in birds, one of the air filled cavities connected with the air passages of the lungs and usually with cavities in the bones; they assist in respiration and lower the body s specific gravity. Domestic fowl have one or two… … Medical dictionary
air sac — n. any of the air filled cavities in a bird s body, having connections to the lungs … English World dictionary
air-sac — airˈ sac noun 1. An alveolus, or the cluster of alveoli, at the termination of a bronchiole in the lungs 2. An outgrowth of the lung in birds, helping respiration or lightening the body 3. In insects, a dilatation of the trachea • • • Main Entry … Useful english dictionary
air sac — air′ sac n. 1) anat. alveolus 2) 2) orn any of certain cavities in a bird s body connected with the lungs • Etymology: 1820–30 … From formal English to slang
air sac — noun 1. a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways • Syn: ↑alveolus, ↑air cell • Derivationally related forms: ↑alveolate (for: ↑alveolus) • Hypernyms … Useful english dictionary
air-sac disease — noun : a serious inflammatory condition of the air sacs of poultry * * * air sac disease «AIR SAK», chronic respiratory disease in domestic fowl … Useful english dictionary
air sac — gas bladder, a thin membranous, sometimes alveolated sac in the dorsal portion of the abdominal cavity. Contains a varying mixture of gases, not identical to the composition of air. May be one, two or three chambered. May be connected to the gut… … Dictionary of ichthyology
air sac — /ˈɛə sæk/ (say air sak) noun 1. a sac containing air. 2. any of certain cavities in a bird s body connected with the lungs. 3. a saclike dilatation of an insect trachea …
