infrared
1. the infrared region of the electromagnetic spectrum; electromagnetic wave frequencies below the visible range (Freq. 1) - they could sense radiation in the infrared • Syn: infrared frequency • Hypernyms: frequency, frequence, oftenness • Part Holonyms: infrared spectrum 2. electromagnetic radiation with wavelengths longer than visible light but shorter than radio waves • Syn: infrared light, infrared radiation, infrared emission • Hypernyms: actinic radiation, actinic ray
having or employing wavelengths longer than light but shorter than radio waves; lying outside the visible spectrum at its red end (Freq. 2) - infrared radiation - infrared photography • Similar to: invisible, unseeable
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