Definition of "cornice"

That ceiling was covered with square compartments,[...] It was supported by a gilded cornice, carved into a thousand curious shapes and emblems, among which the horned wolf, the crest of the Avonleigh family, was conspicuous.

1834, L[etitia] E[lizabeth] L[andon], chapter XV, in Francesca Carrara. […], volume III, London: Richard Bentley, […], (successor to Henry Colburn), page 113

Challenger looked up at the cornice and round at the skirting.

1925 July – 1926 May, A[rthur] Conan Doyle, “(please specify the chapter number)”, in The Land of Mist (eBook no. 0601351h.html), Australia: Project Gutenberg Australia, published April 2019

The half-dozen pieces […] were painted white and carved with festoons of flowers, birds and cupids. […] The bed was the most extravagant piece. Its graceful cane halftester rose high towards the cornice and was so festooned in carved white wood that the effect was positively insecure, as if the great couch were trimmed with icing sugar.

1963, Margery Allingham, chapter 1, in The China Governess‎

Looking to the east we could see Api and the mountains of west Nepal, shapely snow peaks in the distance, while in the immediate foreground, much lower but still dramatic, were the peaks of Panch Chuli IV and V (III was hidden by the lip of a huge cornice), Telkot and Nagling, all of them unclimbed, all steep and challenging.

1999, Harish Kapadia, “Ascents in the Panch Chuli Group”, in Across Peaks & Passes in Kumaun Himalaya, New Delhi: Indus Publishing Company, page 136