colure
noun
co·lure
kəˈlu̇(ə)r,
ˈkōˌl-
plural -s
: a great circle on the celestial sphere passing through the poles and the equinoxes or the solstices
Word History
Etymology
Late Latin coluri, plural, from Greek kolouroi colures, plural of kolouros stump-tailed, from kol- (from kolos docked) + -ouros -urous; from the fact that in temperate latitudes a part is always below the horizon