spectral (adj) - of, pertaining to, or like a phantom or specter; ghostly; of or pertaining to a spectrum [spek-truhl]
BREAKDOWN: SPEC- (look, observe) + -AL (pertaining to)
a specter is a ghost, phantom, or apparition; abstractly a source of terror or dread (also spectre)
“Modern thought has transferred the spectral character of Death to the notion of time itself. Time has become Death triumphant over all.” —John Berger