柯林斯詞典girder /?ɡ??d?/ (girders) 1. N-COUNT A girder is a long, thick piece of steel or iron that is used in the framework of buildings and bridges. 大梁 返回 girder劍橋詞典a long , thick piece of metal or concrete , etc. that supports a roof , floor , bridge , or other large structure 大梁；桁 steel roof girders 鋼制屋梁 返回 girder