|āchənˈdē- noun
Usage: usually capitalized H&D
Etymology: after Ferdinand H urter and Charles D riffield fl 1890
: a number indicating the sensitivity of a photographic emulsion determined by the method of Hurter and Driffield
|āchənˈdē- noun
Usage: usually capitalized H&D
Etymology: after Ferdinand H urter and Charles D riffield fl 1890
: a number indicating the sensitivity of a photographic emulsion determined by the method of Hurter and Driffield
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012