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

Examples of absorbance in a Sentence

Recent Examples on the Web
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Rebecca’s wholehearted characteristics and attributes connect her to the Water sign Pisces, who takes on problems with others due to their absorbance and empathetic nature. Lisa Stardust, People.com, 11 May 2025 This diaper combines the best of both worlds by using two inserts made from 55% hemp for maximum absorbance and 45% cotton to prevent flooding leaks. Lorraine Wilde, Treehugger, 18 July 2023

Word History

Etymology

absorb + -ance

First Known Use

1893, in the meaning defined above

Time Traveler
The first known use of absorbance was in 1893

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Cite this Entry

“Absorbance.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/absorbance. Accessed 26 Jul. 2025.

Medical Definition

: 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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