klappvisier /ˈklæp.vɪˌzɪɹ/ noun1 •(historical) A type of visor, found on medieval European (especially German) helmets, typically hinged at a single point in the middle of the brow of the helmet (rather than hinged on the sides of the skull).In Germany one of the earliest pictorial depictions of a Klappvisier appears to have been shown in the lost Volto santo fresco, formerly on the east wall of the Chapel in Kronberg (see ftn. 27 above). — 2001 formsklappvisiers
