gnomon
/ˈnəʊmɒn/noun
1
- the projecting piece on a sundial that shows the time by the position of its shadow（日晷的）指时针（通过其影子的位置来显示时间）。
1.1
- Astronomy a structure, especially a column, used in observing the sun's meridian altitude【天文】圭表,日圭。
2
- Geometry the part of a parallelogram left when a similar parallelogram has been taken from its corner【几何】磬折形。
派生词
gnomonic
/nəʊˈmɒnɪk/ adjective词源
mid 16th cent.: via Latin from Greek gnōmōn 'indicator, carpenter's square' （related to gignōskein 'know'）.