Etymology of the French word pantaisier
the Old French word pantaisier
derived from the Latin root *pantasiare
derived from the Greek word phantasioun
derived from the Greek word phantasia, φαντασία ((properly abstract) a (vain) show ('fantasy'))
derived from the Greek word phantazein, φαντάζω (to make apparent; to appear (neuter participle as noun, a spectacle))