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peen (n.)

also pein, 1680s, "edged, rounded, or cone-shaped end of a hammer head," opposite the face, which is ordinarily flat; probably from a Scandinavian source (compare Norwegian dialectal penn "peen," Old Swedish pæna "beat iron thin with a hammer"). Earlier as a verb, "to beat thin with a hammer" (1510s).

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Definitions of peen from WordNet

peen (n.)
the part of a hammerhead opposite the flat striking surface (may have various shapes);
From wordnet.princeton.edu