Dictionary

absorbance

noun ab·sor·bance \əb-ˈsr-bən(t)s, -ˈzr-\

Definition of ABSORBANCE

:  the ability of a layer of a substance to absorb radiation expressed mathematically as the negative common logarithm of transmittance

First Known Use of ABSORBANCE

1947

absorbance

noun ab·sor·bance \əb-ˈsr-bən(t)s, -ˈzr-\   (Medical Dictionary)

Medical Definition of ABSORBANCE

:  the ability of a solution or a layer of a substance to absorb radiation that is expressed mathematically as the negative common logarithm of the transmittance of the substance or solution—called also optical density

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