infrared

English Thesaurus

1. the infrared region of the electromagnetic spectrum; electromagnetic wave frequencies below the visible range (noun.attribute)

hypernym	:	frequence, frequency, oftenness,
definition	:	the number of occurrences within a given time period (noun.time)

part meronym	:	infrared spectrum,
definition	:	the spectrum of infrared radiation (noun.phenomenon)

2. electromagnetic radiation with wavelengths longer than visible light but shorter than radio waves (noun.phenomenon)

hypernym	:	actinic radiation, actinic ray,
definition	:	electromagnetic radiation that can produce photochemical reactions (noun.phenomenon)

3. having or employing wavelengths longer than light but shorter than radio waves; lying outside the visible spectrum at its red end (adj.all)

similar	:	invisible, unseeable,
definition	:	impossible or nearly impossible to see; imperceptible by the eye (adj.all)