The word zodiac comes from the Latin zōdiacus, from
the Greek ζῳδιακὸς κύκλος
(zōdiakos kyklos - circle of animals. ζῳδιακὸς
comes from ζῴδιον (zōdion),
a diminutive of ζῷον (zōon - animal).
The name zodiac results from the fact that in the classical Greek
zodiac half of the signs were represented by animals.