Definition from Wiktionary, the free dictionary
See also zodíac
Alternative forms 
Middle English (late 14th century), from Old French zodiaque, from Latin zōdiācus, from Ancient Greek ζωδιακός [κύκλος] (zōdiakos [kuklos], “circle of little animals”), from ζώδι(αι)ον, the diminutive of ζῶον (zōon, “animal”).
zodiac (plural zodiacs)
- (astrology) The belt-like region of the celestial sphere approximately eight degrees north and south of the ecliptic, which thousands of years ago included the apparent path of the sun, moon, and planets.
- (astrology) The twelve equal divisions of the astrological zodiacal region into signs, or houses, of the zodiac, each sign named after a constellation in this region.
- (astronomy) The belt-like region of the celestial sphere corresponding to the apparent path of the sun over the course of a year, the ecliptic.
- (countable) A circle decorated with the signs of the zodiac.
- Any of various astrological systems considered similar to the above.
Derived terms 
belt-like region in the sky
twelve signs in astrology
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