ˈpetsˌväl- noun
Usage: usually capitalized P
Etymology: after Joseph Petzval died 1891 Austrian mathematician and opticist
: a two-element highly achromatized camera objective having low transmission loss
ˈpetsˌväl- noun
Usage: usually capitalized P
Etymology: after Joseph Petzval died 1891 Austrian mathematician and opticist
: a two-element highly achromatized camera objective having low transmission loss
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012