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Noun; 1. A continuous distribution of colored light produced when a beam of white light is dispersed into its components, e.g. by a prism. 2. A range of radiation frequencies that have a particular property. 3. A visual record of the wavelengths of the radiation or particles emitted (see Emit) by a substance, used as a means of analyzing its physical properties such as energy and mass. 4. A range of values, especially one with opposite values at its limits. 5. The range of organisms that an antibiotic can kill.
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