Nouns (6)

infrared, infrared frequency
n. the infrared region of the electromagnetic spectrum; electromagnetic wave frequencies below the visible range; "they could sense radiation in the infrared"
infrared emission, infrared radiation, infrared light, infrared
n. electromagnetic radiation with wavelengths longer than visible light but shorter than radio waves

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Adjectives (1)

infrared
adj. 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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Synonyms (7)

undetectable
adj. not easily seen
camouflaged
adj. made invisible by means of protective coloring
out of sight, hidden, concealed
adj. not accessible to view; "concealed (or hidden) damage"; "in stormy weather the stars are out of sight"
ultraviolet
adj. having or employing wavelengths shorter than light but longer than X-rays; lying outside the visible spectrum at its violet end; "ultraviolet radiation"; "an ultraviolet lamp"
unseen
adj. not seen or perceived; "unseen natural resources"

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