sign' of the zo'diac
1. one of the twelve constellations along the path of the ecliptic.
2. (in contemporary Western astrology) one of the twelve divisions of the ecliptic, each consisting of 30 degrees, marked off from the point of the vernal equinox. See illus. at zodiac.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.