Synonym: apparitional, ghostlike, ghostly, phantasmal, spiritual. Similar words: spectra, electromagnetic spectrum, spectre, spectrum, spectroscopy, spectroscope, light spectrum, spectroscopic. Meaning: ['spektrəl] 
adj. 1. of or relating to a spectrum 2. resembling or characteristic of a phantom.
adj. 1. of or relating to a spectrum 2. resembling or characteristic of a phantom. 
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1. I am studying spectral classification.
2. She is compelling, spectral, fascinating, an unforgettably unique performer.
3. These are all simulated spectral and concentration data.
4. They are members of the V spectral class.
5. A seventh band covers the spectral region in which heat is emitted by the Earth's surface.
6. Beta is a fine orange star of spectral type M, beautiful in binoculars; it has been suspected of slight variability.
7. Balmer had been thinking about the spectral lines from hydrogen.
8. Ahead the red light glowed evilly and the spectral figures moved into its aura to become cardboard silhouettes.
9. The holiday has to do with other worldliness, spectral phenomena, lonesome caped creatures rising across the moon.
10. The Fire Ghost simply bursts into flames, its spectral body surrounded with a huge halo of dancing fire.
11. U, of spectral type M, appears to be irregular, with a range of from 5.6 to 7.5.
12. The use of many plots and their spectral interpretation is to be commended.
13. Intelligences without bodies and beings without form are spectral ghosts guaranteed to mislead.
14. The spectral classes established by asteroid observers are based on the colors and total reflectivity of their targets.
15. Most of the spectral distribution is confined to the central maximum which has a positive upper frequency boundary of.
16. The spectral types were given letters of the alphabet, as follows: O: very hot stars(sentencedict.com), greenish-white or bluish-white.
17. Heating collapses the blue spectral peak, causing the violet luminescence to shift towards red.
18. It should also be remembered that the spectral reflectance curve of living vegetation will change continuously throughout the growing season.
19. An elaborate system of spectral classes has been established by a persistent cadre of asteroid observers.
19. Wish you can benefit from our online sentence dictionary and make progress day by day!
20. Speech spectrum analysis shows rich spectral content.
21. Refracting light without spectral color separation.
22. The prismatic resolution of sunlight into its spectral colors.
23. Spectroscopic measurements in 1960 indicated that small-scale motion of the plasma was producing the doppler broadening of the spectral lines.
24. Of special interest are the clearly presented sections on spectral jumps, and single-spin magnetic resonance experiments.
25. To assess this objectively, we fitted the power spectra to the following function where is the power spectral density at frequency.
26. Polarised Zeeman correction methods have been used to improve the quantitative measurements from flame instruments giving greater stability and reducing spectral noise.
27. I believe that many readers will object to the use of simulated spectral data throughout the text.
28. It rolled towards High Brook in thin, vaporous strands, giving the house a spectral aspect.
29. Then, with a thrill of recognition, Bowman could often glimpse familiar coastlines, shining in that spectral lunar light.
30. Hot ionised gases, and the impurities they contain, also produce spectral lines that are characteristic of the plasma temperature.
More similar words: spectra, electromagnetic spectrum, spectre, spectrum, spectroscopy, spectroscope, light spectrum, spectroscopic, aspect, respect, suspect, specter, inspect, prospect, pectoral, spectator, respected, spectacle, suspected, suspect of, inspector, respecting, retrospect, respectful, respective, disrespect, perspective, prospectus, prospector, inspection.