stenosis
noun [ C or U ] medical specialized uk/stɪˈnəʊ.sɪs/ us/stəˈnoʊ.sɪs/ stenoses
（身体内通道或孔口）狭窄;变窄
a part of a passage or opening in the body that has become abnormally narrow, or the act of this happening
血管（或导管）异常收缩（或变窄）
abnormal constriction or narrowing of a blood vessel or duct