Alveolus
(n.) A cell in a honeycomb.
(n.) A small cavity in a coral, shell, or fossil
(n.) A small depression, sac, or vesicle, as the socket of a tooth, the air cells of the lungs, the ultimate saccules of glands, etc.
Similar Words:
Alveolar Alveolary Alveolate Alveole Alveoli Alveoliform Alveolus Interalveolar