Spectral1. (a.) Of or pertaining to a specter; ghosty.
2. (a.) of or pertaining to the spectrum; made by the spectrum; as, spectral colors; spectral analysis.
Thesaurus Entries
Barmecidal, Barmecide, airy, apparent, apparitional, astral, autistic, bicolor, bicolored, cadaverous, chimeric, chromatic, cold, colorful, colorific, coloring, colory, cool, corpselike, crazy, daedal, deathlike, deceptive, delusional, delusionary, delusive, delusory, dereistic, dichromatic, disembodied, divers-colored, dreamlike, dreamy, ectoplasmic, eerie, erroneous, ethereal, etheric, fallacious, FALSE, fantastic, ghostish, ghostlike, ghostly, ghosty, glowing, harlequin, harmonious, illusional, illusionary, illusive, illusory, imaginary, incorporeal, kaleidoscopic, many-colored, matching, medley, misleading, monochromatic, monochrome, monochromic, motley, multicolor, multicolored, multicolorous, ostensible, parti-color, parti-colored, phantasmagoric, phantasmal, phantasmic, phantom, phantomic, phantomlike, pigmentary, polychromatic, polychrome, polychromic, prismal, prismatic, psychic, rainbow, seeming, self-deceptive, self-deluding, shadowy, shot, shot through, specious, specterlike, spiritual, spooky, supernatural, supposititious, thunder and lightning, tinctorial, tingent, toning, trichromatic, trichromic, tricolor, tricolored, two-tone, unactual, unearthly, unfounded, unreal, unsubstantial, varicolored, variegated, versicolor, versicolored, visionary, warm, weird, wraithlike, wraithy