* Descriptive: The flickering candlelight cast spectral shadows on the wall.
* Scientific: Scientists use spectral analysis to study the composition of stars.
* Figurative: The abandoned house seemed to have a spectral presence, filled with whispers of the past.
* Literary: The poet used spectral imagery to evoke a sense of otherworldly mystery.
* Technical: The engineer analyzed the spectral properties of the signal to optimize its transmission.
Remember that "spectral" can have multiple meanings, so the context of the sentence will determine its precise interpretation.