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in radiology, a measure of the ability of a medium to absorb radiation, expressed as the logarithm of the quotient of the intensity of the radiation entering the medium divided by that leaving it.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

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.
Farlex Partner Medical Dictionary © Farlex 2012


Chemistry A logarithm of the percent transmission of a wavelength of light through a liquid. 
Microbiology A measure of the amount of light absorbed by a suspension of bacteria or an organic solution, measured by spectrophotometry. Absorbance values are used to plot the growth of bacteria in broth and gauge the purity and concentration of molecules in solution.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.


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


a spectrophotometric measurement of the light absorbed by a solution at a particular WAVELENGTH. The absorbance (A) derives from the percentage of light transmitted as follows:

where Io is the incident light intensity and I is the transmitted light intensity. The absorbance is related to the molar absorption coefficient (extinction coefficient) e (cm-1M-1), concentration c (M), and path length l (cm) as follows:

Absorbance can therefore be used to determine the concentration of a substance in solution, to follow conversion of a SUBSTRATE to a product in an enzymic reaction (see ENZYME), and so on.

Absorbance is sometimes referred to as OPTICAL DENSITY, although this term should be used for measurement of light scattering.

Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005


A measure of absorption equal to the logarithm to the base 10 of the reciprocal of the transmittance T, for a specified wavelength and expressed as A = −log10 T. Syn. optical density. See optical density; transmittance.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann
References in periodicals archive ?
subsidiary is increasing the absorbancy of three of its Serenity brand SKUs with slightly larger pads.
Confidence is feeling not only absorbancy assurance, but that only you know a diaper is needed.
The variety of spin-offs continues to do well, according to industry sources, as consumers are drawn to their absorbancy and self-wringing features.
As a result of this open cell structure, this material exhibits low resilience, low compression set, low shock absorbancy and high fluid absorption.
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The result was expressed as one unit of activity was defined as a reduction in absorbancy of 0.001/min.
First Quality retail group, best known for its feminine hygiene and incontinence products, this year introduced its 100% Through-Air Dry paper towel, which is designed to offer nearly twice the absorbancy of a traditional sheet.
The water absorbancy of cotton treated with Plantatex LLE is increased.
Ash has long been a favorite for use in sporting goods and tool handles because of its strength, relative light weight and shock absorbancy. It is a popular choice for hockey sticks, billiard cues, skis, oars and other sporting equipment.
Absorbancy at 412 nm was noted (zero during 5 mln), 0.1 ml OPH was added to the reaction vessel, and readings were continued.