AIR SAC


Meaning of AIR SAC in English

[air sac] n (ca. 1828) 1: one of the air-filled spaces in the body of a bird connected with the air passages of the lungs

2: alveolus 1b

3: a thin-walled dilation of a trachea occurring in many insects

Merriam-Webster English vocab.      Английский словарь Merriam Webster.