Definitions of infrared:
- noun: the infrared part of the electromagnetic spectrum; electromagnetic wave frequencies below the visible range
Example: "They could sense radiation in the infrared"
- noun: electromagnetic radiation with wavelengths longer than visible light but shorter than radio waves
- adjective: having or employing wavelengths longer than light but shorter than radio waves; lying outside the visible spectrum at its red end
Example: "Infrared radiation"
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