ljósfræði (Icelandic) comes from Icelandic ljós, from Old Norse ljós, from Proto-Germanic leuhsą, from Proto-Indo-European lewk-so-m, from Proto-Indo-European lewḱ-, from Proto-Indo-European lewk- — bright; to shine; to see.
ljósfræði (Icelandic): optics
Definitions
optics
Ancestry of “ljósfræði”, step by step
ljósfræði traces back through two separate lines of ancestry.