(The). The noumenon of a phenomenal body. This “spirit body” survives after the death of the material body, and is the “ghost” or “double.” Macbeth's dagger was an astral body; so, in theosophy, is the “kama-rupa” or mind body; and in transubstantiation the veritable “blood and flesh” of Christ is the astral body of the accidents “bread and wine.”
Man is supposed to consist of body, soul, and spirit. The last is the astral body of man.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894