roundabout/'raʊndəˌbaʊt/

a. not in the shortest or most direct way

n. a circular area where several roads meet, which you have to drive around until you reach the road you want

a. [常置于名词前] 绕道的；不直接的：The taxi driver took a roundabout route to the airport. 出租车司机绕道开到机场。

n.〈英〉[C] 环岛，转盘：At the first roundabout, take the third exit. 在第一个转盘，走第三个出口。

构词round + about

用法美语用traffic circle表示“环岛”。