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air sac an air-filled space or cavity in a living organism, esp. any of the ends of certain bronchial tubes in a bird's body that connect with the larger body cavity and assist in breathing.
bronchiectasis chronic dilation of the bronchi or bronchial tubes, often resulting in infection. [2 definitions]
bronchiole any of the small, thin-walled branches of a bronchial tube.
bronchitis inflammation of the mucous membrane lining the bronchial tubes.
hemoptysis the spitting or coughing up of blood from the lungs or bronchial tubes.
windpipe the air passage between the larynx and the bronchial tubes in air-breathing vertebrates; trachea.