sphincter
🇺🇸
/ˈsfɪŋktər/
🇬🇧
/ˈsfɪŋktə(r)/
A muscle that can tighten or relax to control the opening of a body part.
The doctor checked the patient's sphincter to ensure proper functioning.
医生检查了病人的括约肌以确保其正常运作。