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say it: SPEK-truhl
spectral is an adjective meaning "of or relating to a spectrum". It carries 2 recorded senses.
of or relating to a spectrum
“spectral colors”
“spectral analysis”
resembling or characteristic of a phantom
“a ghostly face at the window”
“a phantasmal presence in the room”
“spectral emanations”
“spiritual tappings at a seance”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for spectral come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.