infrared

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infra|red /'ɪnfrə r'ed/
also infra-red
1 [ADJ] ADJ n
Infrared radiation is similar to light but has a longer wavelength, so we cannot see it without special equipment.
2 [ADJ] ADJ n
Infrared equipment detects infrared radiation.
...searching with infra-red scanners for weapons and artillery.

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