More about phantasmagoric
Phantasmagoric “having a fantastic appearance” is a compound of two elements. The first is phantasm “apparition, fantasy,” from Ancient Greek phántasma “image, vision.” This, in turn, comes from the verb phaínein “to bring to light, cause to appear,” which is the source of many fant- and phant- words in English, from fantastic and fantasy to hierophant and phantom. The second element in phantasmagoric is likely to be either from Ancient Greek agorá “assembly, gathering” (as in agoraphobia) or its derivative allēgoría “figurative language” (as in allegory). Phantasmagoric was first recorded in English in the early 1810s.