phantasm
noun/ˈfæntæzəm/
/ˈfæntæzəm/
(formal)- a thing seen in the imagination synonym illusionWord OriginMiddle English (in the sense ‘deceptive appearance’): from Old French fantasme, via Latin from Greek phantasma, from phantazein ‘make visible’, from phainein ‘to show’. The change from f- to ph- in the 16th cent. was influenced by the Latin spelling.
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phantasm