camber

camber
/ˈkæmbə(r); `kæmbɚ/ n
slight upward curve on the surface of sth, esp a road 中凸形, 拱势（物体, 尤指道路, 表面略向上弯的曲面）. camber, v [Tn]
give a camber to (esp a road) 使（尤指路面）拱起
    The street is quite steeply cambered at this point. 这条街的这个地方拱起很高.

牛津英汉双解词典