colures

Colure \Co*lure"\ (k[-o]*l[=u]r"), n.; pl. {Colures}
   (k[-o]*l[=u]rz"). [F. colure, L. coluri, pl., fr. Gr.
   ko`loyros dock-tailed, a"i ko`loyroi (sc. grammai` lines) the
   colures; fr. ko`los docked, stunted + o'yra` 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[deg] from the former, and is called the solstitial colure.
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         Thrice the equinoctial line
         He circled; four times crossed the car of night
         From pole to pole, traversing each colure. --Milton.
   [1913 Webster]