Louver \Lou"ver\, Louvre \Lou"vre\, n. [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.) A small lantern. See Lantern, 2
   (a) . [Written also lover, loover, lovery, and luffer.]

Source: Webster's Revised Unabridged Dictionary (1913)