['lu:θәn]
老虎天窗, 屋顶窗

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}.