There are 2 definitions of spectral in English:

spectral1

Syllabification: spec·tral
Pronunciation: /ˈspektrəl
 
/

adjective

Of or like a ghost.
More example sentences
  • It was probably a good idea to dispense with spectral evidence, since ghosts routinely resist cross-examination.
  • Dripping blood, lightning storms, and midnight crypt visits are only a few of the tricks that The Ghost has up its spectral sleeve.
  • Witnessing his sister's growing infatuation, Macon realizes his feelings are growing for Muriel, especially when he meets her sickly, spectral son, Alexander.
Synonyms
ghostly, phantom, wraithlike, shadowy, incorporeal, insubstantial, disembodied, unearthly, otherworldly
informal spooky

Origin

early 18th century: from specter + -al.

Derivatives

spectrally

adverb
More example sentences
  • Verification of the correct breathing frequency of 12 breaths/min was made by visually counting the respiratory trace on the computer display panel as well as by spectrally decomposing the respiratory wave.
  • The remaining artifact-free data were then spectrally analyzed using discrete Fourier transforms to yield power data for specific frequency bands.

Definition of spectral in:

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Word of the day internecine
Pronunciation: ˌintərˈnesēn
adjective
destructive to both sides in a conflict

There are 2 definitions of spectral in English:

spectral2

Syllabification: spec·tral
Pronunciation: /ˈspektrəl
 
/

adjective

Of or concerning spectra or the spectrum.

Origin

mid 19th century: from spectrum + -al.

Derivatives

spectrally

adverb

Definition of spectral in: