Co-lūre', n.

n.; pl. CO-LŪRES'. [Fr. colure, Lat. coluri, pl., Gr. κόλουρος, dock-tailed, αἱ κόλουροι (sc. γραμμαί, lines), the colures, from κόλος, docked, stunted, and οὐρά, tail; so named because a part is always beneath the horizon.] (Astron. & Geog.) One of two great circles intersecting at right angles in the poles of the equator. One of them passes through the equinoctial points, and hence is denominated the equinoctial colure; the other intersects the equator at the distance of 90° from the former, and is called the solstitial colure.

The space of seven continued nights he rode With darkness, thrice the equinoctial line He circled, four times crossed the car of night From pole to pole, traversing each colure. Milton.