zodiac: a belt-shaped region in the heavens on either side to the ecliptic; divided into 12 constellations or signs for astrological purposes
entity: that which is perceived or known or inferred to have its own distinct existence (living or nonliving)
arsenic: a very poisonous metallic element that has three allotropic forms; arsenic and arsenic compounds are used as herbicides and insecticides and various alloys; found in arsenopyrite and orpiment and realgar