|dēˌīˈen- noun
Etymology: DIN from German, abbreviation of Deutsche Industrie-Normen (literally, German industry standards), standards for industrial products established by the Deutscher Normenausschuss, a German organization for the establishment and registration of standards in all branches of industry
: a system for determining the speed of photographic materials in terms of the logarithm of the reciprocal of the exposure required to obtain a density of 0.1 above fog density