Webster’s Revised Unabridged Dictionary · 1913 Luthern Lu′thern (lū′thẽrn), n. [F. lucarne a dormer, dormer window, garret window, L. lucerna lamp, fr. lucere to be light or clear, fr. lux light. See Light, n., and cf. Lucarne.] (Arch.) A dormer window. See Dormer. ‹ Lutheranism Lutidine ›