1. relating to or resembling a ghost or spirit; ghostly
2. relating to a spectrum of light or other radiation
Usage: scientific

Examples

• A spectral figure appeared in the moonlight.
• The old mansion had a spectral quality that frightened visitors.
• Scientists analyzed the spectral data from the distant star.
• The spectral lines revealed the chemical composition of the gas.
• Her pale, spectral appearance suggested she was ill.
• The spectral analysis showed unusual wavelengths of light.