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plural pelmets
An interior decorative item that is placed above a window to hide the curtain mechanisms, visually similar to a cornice or valance. quotations examples
Sun blinds (recessed in a pelmet) were provided for all windows, except in the corridors.
1979 August, Graham Burtenshaw, Michael S. Welch, “O.V.S. Bulleid's SR loco-hauled coaches - 1”, in Railway World, page 398
The pelmets and mirrors, the spotlights and blinds, seemed rich in criticism.
2004, Alan Hollinghurst, The Line of Beauty […], 1st US edition, New York, N.Y.: Bloomsbury Publishing