ultraviolet spectrum A plot of absorbance vs. wavelength obtained by measuring the amount of radiation absorbed by a sample as a function of the wavelength of incident radiation from the ultraviolet region (190-400 nm) range. [CHMO] two-dimensional ultraviolet spectrum two dimensional ultraviolet spectrum 2D UV spectrum UV spectrum ultra-violet spectrum UV spectra ultraviolet spectrum 2D UV spectrum (abs. over wavelength) ultraviolet spectra ultra-violet spectra ultraviolet spectrum electronic absorption spectrum