Definitions

1. noun

a small air sac in the lungs where gas exchange takes place, especially one in the walls of the alveolar ducts and sacs of the lungs.

“The doctor examined the patient’s alveola to check for any signs of disease.”

2. noun

a small cavity or pit in the surface of a bone, especially one containing a foramen or a nutrient canal.

“The alveola in the bone was found to be filled with a thick layer of bone tissue.”