The story
From phantasm or phantasma (“phantasm”) + -al (suffix meaning ‘of or pertaining to’ forming adjectives).
Etymology from Wiktionary, CC BY-SA 4.0.
phantasmal
phan·tasm·alToday it means: Of or pertaining to, or having the characteristics of, a phantasm (“something seen but having no physical reality”); imaginary, unreal. Full definition →