ˈspektrəl adjective
Etymology: Latin & New Latin spectr um + English -al
1.
a. : of, like, or relating to a specter : ghostly
b. : lacking in solid substance : false , illusory
2. : of or relating to a spectrum : made by the spectrum
spectral analysis
• spec·tral·i·ty spekˈtraləd.ē or spec·tral·ness ˈspektrəlnə̇s noun -es
• spec·tral·ly -rəlē, -li adverb