Invisible portion of the spectrum of electromagnetic radiation with wavelengths longer than those of visible light (about 0.77 m, or 7700 Å, i.e. below the red end, and thus too long to be seen by the human eye).
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acute radiation (Certain amount of radiation received within a brief period. Cf. chronic radiation.)
UV radiation (Invisible (ultraviolet) region of the spectrum of electromagnetic radiation with wavelengths ...)