overmantel

noun

1. A decorative structure, usually plasterwork or carved wood, and sometimes containing a mirror, over a mantelpiece.

   “Ushered into the small front room, Podson found himself restored to a habitable world. A tightly stuffed couch, chintz-covered armchairs, an overmantel mirror with swans painted on it, flowers in various vases, photos in metal frames.”

   “She strode to the fireplace and examined a lidded crystal vase on the overmantel.”