almucantar
/ˌælməˈkæntə(r)/noun
1- Astronomy a circle on the celestial sphere parallel to the horizon; a parallel of altitude【天文】地平纬圈, 等高圈。
1.1
- a telescope mounted on a float resting on mercury, used to determine stellar altitude and azimuth高度方位仪。
词源
Middle English: from medieval Latin almucantarath or obsolete French almucantara, from Arabic almuḳanṭarāt 'lines of celestial latitude'， based on al 'the' + ḳanṭara 'arch'.