‖n.; pl.Alveoli [ L., a small hollow or cavity, dim. of alveus: cf. F. alvéole. See Alveary. ] 1. A cell in a honeycomb. [ 1913 Webster ]
2. (Zool.) A small cavity in a coral, shell, or fossil [ 1913 Webster ]
3. (Anat.) A small depression, sac, or vesicle, as the socket of a tooth, the air cells of the lungs, the ultimate saccules of glands, etc. [ 1913 Webster ]