| airsacculitis | Inflammation of the mucous membrane of the air sacs of birds. (05 Mar 2000) |
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| airsickness | A condition resembling seasickness or other forms of motion sickness occurring in airplane or space flight as a result of erratic and continuous stimuli of the inner ear. (05 Mar 2000) |
| airspace | Pertaining to the portion of the lung distal to the conducting airways or bronchi; alveolar. (05 Mar 2000) |
| airspace-filling pattern | Cloudy to dense opacities, obscuring vascular markings, on chest radiographs. Synonym: airspace-filling pattern. (05 Mar 2000) |