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Definition of Apostilb
1. Noun. (physics) a unit of luminance, being the luminance of a perfectly diffusing surface emitting light at the rate of candela per square metre. Also known as a blondel. ¹
¹ Source: wiktionary.com
Medical Definition of Apostilb
1. A unit of brightness equal to 0.1 millilambert. Origin: G. Apo, from + stilbe, lamp (05 Mar 2000)