Etymology
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alveolus (n.)

1706, "a hollow," especially "the socket of a tooth," from Latin alveolus "a tray, trough, basin; bed of a small river; small hollow or cavity," diminutive of alvus "belly, stomach, paunch, bowels; hold of a ship," from PIE root *aulo- "hole, cavity" (source also of Greek aulos "flute, tube, pipe;" Serbo-Croatian, Polish, Russian ulica "street," originally "narrow opening;" Old Church Slavonic uliji, Lithuanian aulys "beehive" (hollow trunk), Armenian yli "pregnant"). The word was extended in 19c. anatomy to other small pits, sockets, or cells.

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Definitions of alveolus

alveolus (n.)
a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways;
Synonyms: air sac / air cell
alveolus (n.)
a bony socket in the alveolar ridge that holds a tooth;
Synonyms: tooth socket
From wordnet.princeton.edu