Related Clues:

• Lobed organ
• It could use a breath of air
• Alveoli locale
• It's good for a breather
• Air chamber
• Breathing apparatus
• Breathing space?
• Chest part
• Respiratory organ
• It's close to your heart
• Fish's lack
• Breathing organ
• It's found in a chest
• Bronchus outlet
• Air bag, of a sort