spectral

adj.

1. Of or resembling a specter; ghostly.
2. Of, relating to, or produced by a spectrum.

spectrality spec·tral'i·ty (-trăl'ĭ-tē) or spec'tral·ness (-trəl-nĭs) n.
spectrally spec'tral·ly adv.

(SPEK-truhl)

adjective
1. Pertaining to a light energy spectrum, usually the visible spectrum.
2. Pertaining to a ghost, wraith, or apparition.

Etymology
From Latin spectrum (appearance), from Latin specere (to look at)

The visible spectrum of light is a range of energy from an incandescent source, measured in wavelengths, from red to violet. That oft-memorized acronymic fellow ROY G BIV reminds us that the colors of the visible spectrum, from longest wavelength to shortest wavelength, are Red - Orange - Yellow - Green - Blue - Indigo - and Violet.
To be sure, there is an ultraviolet spectrum and an infrared spectrum, but the visible light that we see, as refracted through a prism, are the colors mentioned in the acronym. The appearance or apparition of a ghost gives us the lay term "spectral" as an adjective describing a wraith or a ghost. One therefore has to wonder: at what wavelength do ghosts reside?
-Guest wordsmith Vincent de Luise, MD (eyemusic73ATaol.com)

Usage
"Josh is an adult gripped by broken women, the memory of his dead mother, the spectral presence of his living-dead father and the oddity of messianic Judaism." — Tod Goldberg; A Shipwrecked Life; The Los Angeles Times; Mar 26, 2006.

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adjective

Gruesomely suggestive of ghosts or death: cadaverous, deadly, deathlike, deathly, ghastly, ghostlike, ghostly. See live/die.

IN BRIEF: Ghostly. Also: Relating to a range or series of something.

The people in the third floor room saw a spectral image at the window.

This entry is from Wikipedia, the leading user-contributed encyclopedia. It may not have been reviewed by professional editors (see full disclaimer)

Dansk (Danish)
adj. - spektral-, spøgelsesagtig, åndeagtig

Nederlands (Dutch)
spookachtig, spectraal

Français (French)
adj. - spectral

Deutsch (German)
adj. - geisterhaft, gespenstisch, (Phys.) spektral

Ελληνική (Greek)
adj. - (οπτ.) φασματικός, φασματώδης, που μοιάζει ή αναφέρεται σε φάντασμα

Italiano (Italian)
spettrale

Português (Portuguese)
adj. - espectral, fantasmático

Русский (Russian)
призрачный, похожий на привидение, спектральный

Español (Spanish)
adj. - espectral, fantasmal, de aparecidos

Svenska (Swedish)
adj. - spöklik, spök-

中文（简体）(Chinese (Simplified))
妖怪的, 鬼怪妖魔般的, 幽灵的, 光谱的

中文（繁體）(Chinese (Traditional))
adj. - 妖怪的, 鬼怪妖魔般的, 幽靈的, 光譜的

한국어 (Korean)
adj. - 유령의, 희미한, 스펙트럼의

日本語 (Japanese)
adj. - 幽霊の, 幽霊のような, スペクトルの

العربيه (Arabic)
‏(صفه) شبحي, طيفي, كالشبح‏

עברית (Hebrew)
adj. - ‮כמו רוח, של רפאים, מטיל אימה, של רוח(ות)-רפאים‬

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spectral souls for psp