From German - English Ding/FreeDict dictionary ver. 1.9-fd1: Doublet /dˈuːblət/ <neut, n, sg> [photo.] doublet <n> Synonym: Doppelobjektiv
Doublet /dˈuːblət/ <neut, n, sg> [photo.] doublet <n> Synonym: Doppelobjektiv