1. (辐射)红外线的
Infrared radiation is similar to light but has a longer wavelength, so we cannot see it without special equipment.
2. 对红外辐射敏感的
Infrared equipment detects infrared radiation.
1. the infrared region of the electromagnetic spectrum
electromagnetic wave frequencies below the visible range
e.g. they could sense radiation in the infrared
Synonym: infrared frequency
2. electromagnetic radiation with wavelengths longer than visible light but shorter than radio waves