a wedgelike, spherical, or other striking end of a hammer head opposite the face.
verb (used with object)
to enlarge, straighten, or smooth with a peen.
to strengthen (a metal surface) by light hammering or by bombardment with steel balls or shot.

1505–15; earlier pen < Scandinavian; compare Swedish, Norwegian pen (noun) in same sense (perhaps < German Pinne peen). See pin Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
peen (piːn)
1.  the end of a hammer head opposite the striking face, often rounded or wedge-shaped
2.  (tr) to strike with the peen of a hammer or with a stream of metal shot in order to bend or shape (a sheet of metal)
[C17: variant of pane, perhaps from French panne, ultimately from Latin pinna point]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1683, "sharp or thin end of a hammer head, opposite the face," probably from a Scand. source (cf. Norw. dial. penn "peen," O.Swed. pæna "beat iron thin with a hammer"). Earlier as a verb, "to beat thin with a hammer" (1513).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
He was shaping it with millions of identical taps from a ball-peen hammer.
His tools, notably a three-pound ball-peen hammer, clanked in a greasy leather bag suspended from the handlebars.
Sounding is done by striking the concrete surface with a steel rod or ball-peen hammer, or by dragging a chain along the surface.
They never messed with his peen and never messed with his fingernails.
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