- nounthe efficiency with which electromagnetic radiation produces a photochemical reaction plotted as a function of the wavelength of the radiation• Hypernyms: ↑spectrum
* * *noun: a graphic representation of a physiological reaction; specifically : physiological activity plotted against light wavelength
* * *action spectrum noun (botany)The relationship between the rate of a light-dependent physiological process (eg photosynthesis) and the wavelength of light• • •Main Entry: ↑action
* * *action spectrum,a chart of the varying intensity of a photochemical or other reaction to light of different wave lengths.
Useful english dictionary. 2012.
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