Pronunciation: (ul"tru-vī'u-lit), [key]
1. beyond the violet in the spectrum, corresponding to light having wavelengths shorter than 4000 angstrom units.
2. pertaining to, producing, or utilizing light having such wavelengths: an ultraviolet lamp. Cf. infrared.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.