arcus       
noun [ C or U ]  medical specialized uk/ˈɑː.kəs/ us/ˈɑːr.kəs/  arcus
 (身体部位的)弓形
a feature in the body that is curved in shape
  Corneal arcus is frequently associated with early coronary artery disease. 老年环是冠状动脉疾病早期常见病症。 
 
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