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New American Oxford Dictionary

perfin

perf in |ˈpərfin ˈpərfɪn | ▶noun Philately a postage stamp perforated with the initials or insignia of an organization, esp. to prevent misuse. ORIGIN 1950s: from perf (orated ) in (itials ).

 

Oxford Dictionary

perfin

perfin |ˈpəːfɪn | ▶noun Philately a postage stamp perforated with the initials or insignia of an organization, especially to prevent misuse. ORIGIN 1950s: from perf (orated ) in (itials ).