圆的单词是circular。circular的例句：The work interposes a glass plate between two large circular mirrors（该艺术品在两面圆形大镜子中间插入一块玻璃板）。

circular的例句：Both sides of the river can be explored on this circular walk（沿着这条环行线路走一圈，河的两边都可以看到）；The new device emits a powerful circular column of light（新设备发出明亮的圆形光柱）。