flange flAndV n [C] a flat surface sticking out from an object, which is used to fix it to something or to make it stronger 凸缘，(梁)翼缘 The flange around the wheels on railway trains and carriages helps to keep them on the rails. 铁路火车及车厢轮子上的凸缘可以使轮子卡住轨道。