alveolus

Noun
  1. is a type of: sac - a structure resembling a bag in an animal
    is a part of: lung - either of two saclike respiratory organs in the chest of vertebrates; serves to remove carbon dioxide and provide oxygen to the blood
    same as: air cell, air sac
  2. is a type of: socket - a bony hollow into which a structure fits
    is a part of: alveolar process, alveolar ridge, gum ridge - a ridge that forms the borders of the upper and lower jaws and contains the sockets of the teeth
    same as: tooth socket

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