| visible spectrum | That part of electromagnetic radiation that is visible to the human eye; it extends from extreme red, 7606 A |
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| visible | 1. Perceivable by the eye; capable of being seen; perceptible; in view; as, a visible star; the least spot is visible on white paper. "Maker of heaven and earth, and of all things visible and invisible." (Bk. Of Com. Prayer) "Virtue made visible in outward grace." (Young) 2. Noticeable; apparent; open; conspicuous. "The factions at court were greater, or more visible, than before." (Clarendon) Visible church, the apparent church of Christ on earth; the whole body of professed believers in Christ, as contradistinguished from the invisible, or real, church, consisting of sanctified persons. Visible horizon. Same as Apparent horizon, under Apparent. Vis"ibleness, Vis"ibly. Origin: L. Visibilis, fr. Videre, visum, to see: cf. F. Visible. See Vision. Source: Websters Dictionary (01 Mar 1998) |
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| visible light | <physics> Electromagnetic radiation with wavelengths between 400 nanometres and 750 nanometres. Electromagnetic radiation within this range can be detected by the human eye. Colours depend on the wavelength lengths, a short wavelength (the 400 nm side) looks blue and a long wavelength (the 750 nm side) looks red. (09 Oct 1997) |
| absorption spectrum | <chemistry> A graph of the amount of light a substance absorbs, plotted as a fuction of energy, frequency or wavelength. (15 Jan 1998) |
| antimicrobial spectrum | See: spectrum. (05 Mar 2000) |
| broad spectrum | <pharmacology> Often used to describe an antibiotic that is effective against a wide range of microorganisms. (13 Nov 1997) |
| broad spectrum antibiotic | An antibiotic having a wide range of activity against both Gram-positive and Gram-negative organisms. (05 Mar 2000) |
| Raman spectrum | The characteristic array of light produced by the Raman effect. (05 Mar 2000) |
| chromatic spectrum | The continuum of colours that white light forms on passing through a prism or diffraction grating. Synonym: colour spectrum. (05 Mar 2000) |
| colour spectrum | The continuum of colours that white light forms on passing through a prism or diffraction grating. Synonym: colour spectrum. (05 Mar 2000) |
| wide spectrum | See: spectrum. (05 Mar 2000) |
| continuous spectrum | A spectrum in which there are no absorption bands or lines. (05 Mar 2000) |
| spectrum | A charted band of wavelengths of electromagnetic vibrations obtained by refraction and diffraction. By extension, a measurable range of activity, such as the range of bacteria affected by an antibiotic (antibacterial spectrum) or the complete range of manifestations of a disease. (18 Nov 1997) |
| spectrum analysis | The measurement of the amplitude of the components of a complex waveform throughout the frequency range of the waveform. (12 Dec 1998) |
| spectrum analysis, mass | Analysis of the mass of an object through means of determining the wave length(s) at which electromagnetic energy is absorbed by that object. (12 Dec 1998) |
| spectrum analysis, raman | Analysis of the intensity of raman scattering of monochromatic light as a function of frequency of the scattered light. (12 Dec 1998) |