A frame or ‘coaming’ round the top of a well (to which the lids or covers are fastened).

(a) a frame or masonry border round the mouth of a well; (b) a circular frame on which the lining of a well is built (now rare).

A stone curb surrounding the mouth of a well, often decorated with figures depicting mythological scenes; (occasionally) a small building or…

= curb, n. 8.

= well-curb n.

A curvilinear wall-plate at the springing of a dome, etc.; = curb, n. 9(a) 8b; also, the plate or frame round the mouth of a well, etc.; the…