Spectral

a.	1.	Of or pertaining to a specter; ghosty. He that feels timid at the spectral form of evil is not the man to spread light. - F. W. Robertson.
	2.	(Opt.) Of or pertaining to the spectrum; made by the spectrum; as, spectral colors; spectral analysis. Spectral lemur (Zool.) See Tarsius.

Adj.	1.	spectral - of or relating to a spectrum; "spectral colors"; "spectral analysis"
	2.	spectral - like or being a phantom; "a ghostly face at the window"; "a phantasmal presence in the room"; "spectral emanations"; "spiritual tappings at a seance" Synonyms: apparitional, ghostlike, ghostly, phantasmal, spiritual

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