colure
/kəˈljʊə(r)/noun
- Astronomy either of two great circles intersecting at right angles at the celestial poles and passing through the ecliptic at either the equinoxes or the solstices【天文】分至圈。
词源
late Middle English: from late Latin coluri (plural), from Greek kolourai （grammai） 'truncated (lines)', from kolouros 'truncated', so named because the lower part is permanently cut off from view.