Definition of "bronchioles" [bronchioles]

• Plural form of bronchiole. (noun)

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• "These in turn branch out into thousands of tiny tubes called bronchioles."
• "When small airways called bronchioles get doused with histamine, they swell and fill with mucus (chart)."
• "The condition develops when small airways called bronchioles become inflamed and swollen, restricting how much air can enter and leave the lungs."