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From The Collaborative International Dictionary of English v.0.48:
Zodiac \Zo"di*ac\, n. [F. zodiaque (cf. It. zodiaco), fr. L. zodiacus, Gr. ? (sc. ?), fr. ?, dim. of zw^,on an animal, akin to ? living, ? to live.] [1913 Webster] 1. (Astron.) (a) An imaginary belt in the heavens, 16[deg] or 18[deg] 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. [1913 Webster] 2. A girdle; a belt. [Poetic & R.] [1913 Webster] By his side, As in a glistering zodiac, hung the sword. --Milton. [1913 Webster]