1) Alternative spellings of a building term with a long history in Italy. It referred to ornamental mouldings.
1621 Item cornishe about per yerd iijd, Brandsby
1682 shall lay in the middle of the said wall’s foreside and end one cornice at the first floore height of nyne inches thick, Scriven. These were often internal and the word came also to be used of the mantleshelf: 1724 repairing of one chimney cornish
1836 Door & Cornish Ł1 2 0, South Crosland.