infrared ray infrared radiation • infrared spectrum · · · Info · Definitions · Characters · · infrared ray · · Text Common · · Latin · · Scripts 12 · · Length 3 · · Syllables Definitions · · · (noun) a ray of infrared radiation; produces a thermal effect (as from an infrared lamp). Synonyms: infrared ray. · · Noun Definition 1 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 r latin small letter r U+0072 y latin small letter y U+0079