equa·tor /ɪˈkwetɚ/
 赤道


 equa·tor /ɪˈkwetɚ, ˈɪˌ/ 名詞
 赤道,中緯線


 E·qua·tor n.
 1. Geog. The imaginary great circle on the earth's surface, everywhere equally distant from the two poles, and dividing the earth's surface into two hemispheres.
 2. Astron. The great circle of the celestial sphere, coincident with the plane of the earth's equator; -- so called because when the sun is in it, the days and nights are of equal length; hence called also the equinoctial, and on maps, globes, etc., the equinoctial line.
 Equator of the sun or Equator of a planet Astron., the great circle whose plane passes through through the center of the body, and is perpendicular to its axis of revolution.
 Magnetic equator. See Aclinic.

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 equator
      n 1: an imaginary line around the Earth forming the great circle
           that is equidistant from the north and south poles; "the
           equator is the boundary between the northern and
           southern hemispheres"
      2: a circle dividing a sphere or other surface into two usually
         equal and symmetrical parts