infrared radiation infrared light • infrared ray · · · Info · Definitions · Synonyms · Characters · · infrared radiation · · Text Common · · Latin · · Scripts 18 · · Length 6 · · Syllables Definitions · · · (noun) electromagnetic radiation with wavelengths longer than visible light but shorter than radio waves. Synonyms: infrared, infrared light, infrared radiation, infrared emission. · · Noun Definition 1 Synonyms · · · infrared · · Synonym 1 infrared light · · Synonym 2 infrared emission · · Synonym 3 Characters · · space U+0020 a latin small letter a U+0061 d latin small letter d U+0064 e latin small letter e U+0065 f latin small letter f U+0066 i latin small letter i U+0069 n latin small letter n U+006E o latin small letter o U+006F r latin small letter r U+0072 t latin small letter t U+0074