Definition of phantasm noun from the Oxford Advanced Learner's Dictionary

 

phantasm

 noun
noun
BrE BrE//ˈfæntæzəm//
 
; NAmE NAmE//ˈfæntæzəm//
 
(formal)
 
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a thing seen in the imagination synonym illusion Word Origin Middle 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.
See the Oxford Advanced American Dictionary entry: phantasm