a long strong iron or steel bar used for building bridges and the framework of large buildings （桥或建筑物的）梁，主梁，桁架 It was a confusing picture of pipes and girders. 这是一张混乱的管道和大梁的图片。 The unfinished building with its blue girders was being used as a huge climbing frame. 这座未完工的大楼有蓝色的大梁，当时正被人们当作游乐用的大型攀爬架。
Word Originearly 17th cent.: from gird in the archaic sense ‘brace, strengthen’.