spectrally

/ˈspɛktrəli/
adverb
  1. In a way that relates to or involves a spectrum, especially the spectrum of light or other electromagnetic radiation.
    • The light was spectrally analyzed to determine its chemical composition.
    • The sensor can measure how objects reflect light spectrally across many wavelengths.
    • Different stars emit light that is spectrally distinct, allowing astronomers to identify them.
  2. In a ghostly or eerie manner; like a specter.
    • The old house loomed spectrally against the night sky.
    • A figure appeared spectrally at the end of the dark hallway.
    • The fog rolled in spectrally, covering the graveyard in a pale mist.
Synonyms
What does "spectrally" mean? | whatsthatwordmean | whatsthatwordmean