peen

The end of a hammerhead opposite the flat striking surface, often wedge-shaped or ball-shaped and used for chipping, indenting, and metalworking.

To hammer, bend, or shape with a peen.

To treat by striking regularly all over with the peen of a hammer.

That end of a hammer-head or similar tool which terminates in an edge, or in a sharp, rounded cone-shaped, hemispherical, or otherwise specially modified point, as distinguished form the ordinary flat face. See also cuts under hammer.

A round-edged, or hemispherical, end to the head of a hammer or sledge, used to stretch or bend metal by indentation.