meatus       
noun [ C ]  medical specialized /miˈeɪ.təs/ us/miˈeɪ.t̬əs/  meatus /miˈeɪ.təs/ us/-t̬əs/ meatuses
 (身体部分,尤指通向体外的)道,口
an opening in the body, especially one leading to the outside of the body
  the acoustic meatus 耳道 
 
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