D defs.my
Entry 2 senses Webster, 1913

Zodiac

/zōd'-ē-ăkˌ/ · Zo·di·ac · IPA /ˈzoʊ.diˌæk/
01 n. 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 constell…
  1. 1.
    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.(Astron.)
  2. 2.
    A girdle; a belt.[Poetic & R.]
    “By his side, As in a glistering zodiac, hung the sword.” Milton.