infrared frequency infrared emission • infrared lamp · · · Info · Definitions · Synonyms · Characters · · infrared frequency · · Text Common · · Latin · · Scripts 18 · · Length 6 · · Syllables Definitions · · · (noun) the infrared region of the electromagnetic spectrum; electromagnetic wave frequencies below the visible range. Synonyms: infrared, infrared frequency. Example: "They could sense radiation in the infrared." · · Noun Definition 1 Synonyms · · · infrared · · Synonym 1 Characters · · space U+0020 a latin small letter a U+0061 c latin small letter c U+0063 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 q latin small letter q U+0071 r latin small letter r U+0072 u latin small letter u U+0075 y latin small letter y U+0079