Louver
Pronunciation : Lou"ver, Lou"vre
Part of Speech : n.
Etymology : [OE. lover, OF. lover, lovier; or l'ouvert the opening, fr. overt, ouvert, p. p. of ovrir, ouvrir, to open, F. ouvrir. Cf. Overt.] (Arch.)
Definition : Defn: A small lantern. See Lantern, 2 (a) [Written also lover, loover, lovery, and luffer.] Louver boards or boarding, the sloping boards set to shed rainwater outward in openings which are to be left otherwise unfilled; as belfry windows, the openings of a louver, etc. -- Louver work, slatted work.
Source : Webster's Unabridged Dictionary, 1913