optic density


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ab·sor·bance (A, A),

(ab-sōr'bants),
spectrophotometry log of the ratio of the radiant power of the incident radiation to the radiant power of the transmitted radiation.

ab·sor·bance

(ăb-sōr'băns)
spectrophotometry 2 minus the log of the percentage transmittance of light.
Synonym(s): extinction (2) , optic density.