windmill
noun [ C ] uk/ˈwɪnd.mɪl/ us/ˈwɪnd.mɪl/
风车房;风力磨坊;风车
a building or structure with large blades on the outside that, when turned by the force of the wind, provide the power for getting water out of the ground or crushing grain
风力发电机（同 wind turbine）
a wind turbine
(US pinwheel)（儿童玩具）风车
a child's toy that consists of a stick with brightly coloured pieces of plastic at one end that turn around when you blow them or hold the toy in the wind