INFRARED

infrared

1. [Noun]: the infrared part of the electromagnetic spectrum; electromagnetic wave frequencies below the visible range; "they could sense radiation in the infrared"

2. [Noun]: electromagnetic radiation with wavelengths longer than visible light but shorter than radio waves

3. having or employing wavelengths longer than light but shorter than radio waves; lying outside the visible spectrum at its red end; "infrared radiation"; "infrared photography"

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