This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. (physics) a measure of the extent to which a substance transmits light or other electromagnetic radiation

"Remarkably, the new technique, which the researchers call absorbance modulation, makes it possible to create lines that are only about one-tenth as wide as the wavelength of light used to create them."

density    denseness   

seismic-type    Hus    water-holding    cubage    computer-link    convergence/divergence    ordinate    chromatogram    rheological    calorimetric