dilator

详细解释:n. 详述者, 扩张器, 扩张肌
【医】 扩张器, 扩张肌, 开大肌

英语解释：

名词 dilator:

a muscle or nerve that dilates or widens a body parta drug that causes dilationa surgical instrument that is used to dilate or distend an opening or an organ同义词：dilater