Adverb
In the form or manner of a specter.
Source: Webster's dictionaryThe appeal of the spectrally macabre is generally narrow because it demands from the reader a certain degree of imagination and a capacity for detachment from everyday life. H. P. Lovecraft
At the great iron gate of the churchyard he stopped and looked in. He looked up at the high tower spectrally resisting the wind, and he looked round at the white tombstones, like enough to the dead in their winding-sheets, and he counted the nine tolls of the clock-bell. Charles Dickens
Beyond the fence the forest stood up spectrally in the moonlight, and through the dim stir, through the faint sounds of that lamentable courtyard, the silence of the land went home to one's very heart - its mystery, its greatness, the amazing reality of its concealed life. Joseph Conrad
Although the bandwidth of an AM signal is narrower than one using frequency modulation (FM), it is twice as wide as single-sideband techniques; it thus may be viewed as spectrally inefficient. Source: Internet
From subsequent analysis of this data, Dactyl appears to be an SII subtype S type asteroid, and is spectrally different from 243 Ida. Source: Internet
Non-perchlorate flares Many in-service colored signal flares and spectrally balanced decoy flares contain perchlorate oxidizers. Source: Internet