spectral
adj. C1 Advanced US //ˈspɛktɹəɫ// UK //spˈɛktɹəl// spec·tral
adj. describing something that looks like a ghost or is related to ghosts. It can also describe the colors you see in a rainbow or through a prism.
adj. relating to or resembling a ghost or phantom; also pertaining to the spectrum of light and its constituent colors.
A spectral figure appeared in the window of the old house.
The moonlight cast a spectral glow over the abandoned graveyard, making every shadow look like a spirit.
The scientist used a prism to analyze the spectral composition of the light, identifying the specific wavelengths emitted by the distant star.
From spectre + -al.
From spectrum + -al.
Usage
Often used in literary contexts to describe pale or eerie appearances; in scientific contexts, it refers to the electromagnetic spectrum.