- the part of the respiratory passages distal to the respiratory bronchiole; from it arise alveolar sacs and alveoli;
- the smallest of the intralobular ducts in the mammary gland, into which the secretory alveoli open.
Synonym(s): ductulus alveolaris
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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.