Pronunciation: spek′trŭm, -ă, -ŭmz
- The range of colors presented when white light is resolved into its constituent colors by being passed through a prism or through a diffraction grating: red, orange, yellow, green, blue, indigo, and violet, arranged in increasing frequency of vibration or decreasing wavelength.
- Figuratively, the range of pathogenic microorganisms against which an antibiotic or other antibacterial agent is active.
- The plot of intensity versus wavelength of light emitted or absorbed by a substance, usually characteristic of the substance and used in qualitative and quantitative analysis.
- The range of wavelengths presented when a beam of radiant energy is subjected to dispersion and focused.
[L. an image, fr. specio, to look at]