Dictionary:

phantasma

  (făn-tăz'mə)

See phantasm (sense 1) (sense 2).

[Ultimately from Greek phantasma. See phantasm.]

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noun

1. A supernatural being, such as a ghost: apparition, bogey, bogeyman, bogle, eidolon, ghost, phantasm, phantom, revenant, shade, shadow, specter, spirit, visitant, wraith. Informal spook. Regional haunt. See beings, supernatural.
2. An illusory mental image: daydream, dream, fancy, fantasy, fiction, figment, illusion, phantasm, reverie, vision. See real/imaginary.
3. An erroneous perception of reality: delusion, hallucination, ignis fatuus, illusion, mirage, phantasm, will-o'-the-wisp. See real/imaginary.