[peen] 
| 1. | a wedgelike, spherical, or other striking end of a hammer head opposite the face. |
| 2. | to enlarge, straighten, or smooth with a peen. |
| 3. | to strengthen (a metal surface) by light hammering or by bombardment with steel balls or shot. |
| peen (pēn) n. The end of a hammerhead opposite the flat striking surface, often wedge-shaped or ball-shaped and used for chipping, indenting, and metalworking. tr.v. peened, peen·ing, peens To hammer, bend, or shape with a peen. [Probably of Scandinavian origin.] |