theodolite
noun [ C ] geography specialized uk/θiˈɒd.əl.aɪt/ us/θiˈɑː.də.laɪt/
经纬仪（像小型望远镜的一种设备，用于测量水平角和直角）
a piece of equipment like a small telescope, used for measuring horizontal and vertical angles
The surveyor set up his theodolite and took some measurements. 测量员安置好经纬仪，作了几次测量。