|—n , pl -li|
|1.||any small pit, cavity, or saclike dilation, such as a honeycomb cell|
|2.||any of the sockets in which the roots of the teeth are embedded|
|3.||any of the tiny air sacs in the lungs at the end of the bronchioles, through which oxygen is taken into the blood|
|[C18: from Latin: a little hollow, diminutive of alveus]|
alveolus al·ve·o·lus (āl-vē'ə-ləs)
n. pl. al·ve·o·li (-lī')
A small angular cavity or pit, such as a tooth socket or an air sac.