| bronchioles | The tiny branches of air tubes within the lungs which are the continuation of bronchi and connect to the alveoli (air sacs). (12 Dec 1998) |
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| respiratory bronchioles | The smallest bronchioles (0.5 mm in diameter) that connect the terminal bronchioles to alveolar ducts; alveoli rise from part of the wall. Synonym: bronchioli respiratorii. (05 Mar 2000) |
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