ghosts (pretas, egui (餓鬼)): Sentient beings from another realm of the desire world who have material bodies, but of a different sort than humans. Some ghosts or spirit beings inhabit the human and heavenly realms, but some live in their own place. They are not visible to most humans. They vary in level of accomplishment and may have considerable supernormal powers. Miserliness and greed are the primary causes for incarnation in this realm. Sometimes referred to as "hungry ghosts" as they never get enough of what they want and are always hungry.
[see also: Ghost