noun Colure n. (pl. colures) (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. "Thrice the equinoctial line He circled; four times crossed the car of night From pole to pole, traversing each colure."
Collaborative International Dictionary of English 0.48
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