mid-13c., fantesme, "that which has only seeming reality, permanence, or value;" c. 1300 as "an illusory experience or object; an apparition;" from Old French fantosme "a dream, illusion, fantasy; apparition, ghost, phantom" (12c.), and directly from Latin phantasma "an apparition, specter," in Late Latin also "appearance, image," from Greek phantasma "image, phantom, apparition; mere image, unreality," from phantazein "to make visible, display," from stem of phainein "to bring to light, make appear; come to light, be seen, appear; explain, expound, inform against; appear to be so," from PIE root *bha- (1) "to shine." Spelling conformed to Latin from 16c. (see ph). A spelling variant of phantom, "differentiated, but so that the differences are elusive" [Fowler].
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Harper, D. (n.d.). Etymology of phantasma. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/phantasma