fantasm

noun [抽象名词]幻觉

A ghost or specter, A figment of the imagination, A mental representation of a real object, Something that exists in perception only, and An erroneous mental representation.
鬼或幽灵，想象的虚构，真实物体的心理表征，只存在于感知中的东西，以及错误的心理表征。