Definitions

from The Century Dictionary.

  • noun In vegetable pathol., a disease of the grape, characterized by the falling of the flowers and the imperfect development of the fruit. It has been attributed chiefly to unfavorable climatic conditions.
  • noun In astronomy and geography, one of two circles of declination intersecting each other at right angles in the poles of the world, one of them passing through the solstitial and the other through the equinoctial points of the ecliptic, viz., Cancer and Capricorn, Aries and Libra, and thus dividing both the ecliptic and the equinoctial into four equal parts.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun astronomy Either of two great circles (meridians), that intersect at the poles and either the equinoxes or solstices

Etymologies

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  • intersection of great circles or literally docked tails

    June 20, 2007