dilatation
noun [ U ] medical specialized uk/ˌdɪl.əˈteɪ.ʃən/ us/ˌdɪl.əˈteɪ.ʃən/
扩张，扩张术
the process of becoming wider or more open, or the act of making something do this
Dilatation of blood vessels is always associated with increased blood flow and increased blood pressure. 血管扩张总是跟血流量增加和血压升高有关联。
Balloon dilatation is a safe and effective treatment for patients with tight urethral strictures. 气囊扩张法是治疗尿道狭窄的一种安全有效的方法。