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nouneither of two saclike respiratory organs in the chest of vertebrates; serves to remove carbon dioxide and provide oxygen to the bloodtype of:part of:
Parts of lung
- "air sac"
- "alveolar bed"
- "alveolus"
- "bronchial artery"
- "lobe of the lung"
- "pulmonary vein"
- "vena pulmonalis"
- "air cell"