Zodiac 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 constellations, which one constituted, and from which were named, the twelve signs of the zodiac.

Zodiac n. : A figure representing the signs, symbols, and constellations of the zodiac.

Zodiac n. : A girdle; a belt.

Example:
What type of Zodiac christmas present should I get my best friend?

Taxonomy
the zodiac, constellations, Zodiac, ecliptic, astrology, Sun, astronomy, Aries, Lion, vernal equinox, Bull, Aquarius, Crab, Scales, Fish, zodiac signs, Scorpio, boundaries.

Defination from the web:
zodiac, which comes from the Greek word, zoon, meaning animal.