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colure

noun
co·​lure | \kəˈlu̇(ə)r, ˈkōˌl-\
plural -s

Definition of colure 

: a great circle on the celestial sphere passing through the poles and the equinoxes or the solstices

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History and Etymology for colure

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

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