Aura

In occult terminology, a pyschic effluvium that emanates from human and animal bodies and inanimate objects. It is composed of electro-vital and electro-mental magnetism; an envelope surrounding that of which it partakes – visible only to the psychic. The aura is multicolored and brilliant, or dull, according to the character or quality of the person or thing. To the seer, the aura of a person is an index to his hidden propensities. 

DeVore, Nicholas. Encyclopedia of Astrology. New York: Philosophical Library, 1947.