dilatation
/ˌdaɪləˈteɪʃən/noun
mass noun
1- chiefly Medicine & Physiology the process of becoming dilated【主医, 主生理】扩张。
1.1
- the action of dilating a vessel or opening（对容器或开口的）扩张。
1.2
- count noun a dilated part of a hollow organ or vessel（中空器官或容器的）扩张部分。
词源
late Middle English: via Old French from late Latin dilatatio（n-）, from the verb dilatare （see DILATE）.