Noun alveolus has 2 senses
  1. alveolus, air sac, air cell - a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways
    --1 is a kind of sac
    --1 is a part of lung
  2. tooth socket, alveolus - a bony socket in the alveolar ridge that holds a tooth
    --2 is a kind of socket
    --2 is a part of alveolar ridge, gum ridge, alveolar process
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