al·ve·o·lus /ælˈviələs/
  小孔,齒槽,肺泡
  al·ve·o·lus /ælˈvɪələs/ 名詞
  (複alveoli)(小)泡,(小)槽
  Al·ve·o·lus n.; pl. Alveoli
  1. A cell in a honeycomb.
  2. Zool. A small cavity in a coral, shell, or fossil
  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.
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  alveolus
       n 1: a tiny sac for holding air in the lungs; formed by the
            terminal dilation of tiny air passageways [syn: air sac,
             air cell]
       2: a bony socket in the alveolar ridge that holds a tooth [syn:
           tooth socket]
       [also: alveoli (pl)]