brachistochrone
/brəkɪstəkrəʊn/noun
- a curve between two points along which a body can move under gravity in a shorter time than for any other curve最速降线, 捷线（指连接两点的曲线; 物体在重力作用下沿此曲线运动所需时间较任何其他曲线为短）。
词源
late 18th cent.: from Greek brakhistos 'shortest' + khronos 'time'.