optic density

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ab·sor·bance (A, A),

spectrophotometry log of the ratio of the radiant power of the incident radiation to the radiant power of the transmitted radiation.
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spectrophotometry 2 minus the log of the percentage transmittance of light.
Synonym(s): extinction (2) , optic density.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012