柯林斯詞典reamer /?ri?m?/ 1. N a steel tool with a cylindrical or tapered shank around which longitudinal teeth are ground, used for smoothing the bores of holes accurately to size 鑽孔器; 鉸牀 返回 reamer劍橋詞典a tool used to make holes larger or an exact size 擴(kuò)孔鑽；鉸刀；打孔鑽 返回 reamer