zo·di·ac /ˈzodiˌæk/
  十二宮圖,黃道帶
  Zo·di·ac n.
  1. Astron. (a) An imaginary belt in the heavens, 16° or 18° broad, in the middle of which is the ecliptic, or sun's path. It comprises the twelve constellations, which one constituted, and from which were named, the twelve signs of the zodiac.  (b) A figure representing the signs, symbols, and constellations of the zodiac.
  2. A girdle; a belt.  [Poetic & R.]
  By his side,
  As in a glistering zodiac, hung the sword.   --Milton.
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  zodiac
       n 1: a belt-shaped region in the heavens on either side to the
            ecliptic; divided into 12 constellations or signs for
            astrological purposes
       2: (astrology) a circular diagram representing the 12 zodiacal
          constellations and showing their signs