noun
mixture of gases (mainly oxygen and nitrogen) which cannot be seen, but which exists all around us and which is breathed; the air in the mountains felt cold; he breathed the polluted air into his lungs
air bed = mattress which is filled with air, used to prevent the formation of bedsores
see also CONDUCTION
air embolism = interference with blood flow caused by air bubbles
air hunger = condition where the patient needs air because of lack of oxygen in the tissues
air passages = tubes, formed of the nose, pharynx, larynx, trachea and bronchi, which take air to the lungs
air sac or alveolus = small sac in the lungs which contains air