Luthern

from The Collaborative International Dictionary of English v.0.48

Luthern \Lu"thern\, 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}.
   [1913 Webster]