- Astronomy A band of the celestial sphere extending about 8° to either side of the ecliptic that represents the path of the principal planets, the moon, and the sun.
- In astrology, this band divided into 12 equal parts called signs, each 30° wide, bearing the name of a constellation for which it was originally named but with which it no longer coincides owing to the precession of the equinoxes.
- A diagram or figure representing the zodiac.
- A complete circuit; a circle.

Z10 - O1 - D2 - I1 - A1 - C3 has 18 points in Scrabble!

Z10 - O1 - D2 - I1 - A1 - C4 has 19 points in Words with Friends!

Found in the OTCWL2014, SOWPODS, ENABLE, and WWF dictionaries