• synonyms


[im-pur-fer-it, -fuh-reyt]
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  1. Also im·per·fo·rat·ed. not perforate; having no perforation.
  2. Philately. (of a number of stamps joined together) lacking the perforations usually separating individual stamps.
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  1. an imperforate stamp.
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Origin of imperforate

First recorded in 1665–75; im-2 + perforate
Related formsim·per·fo·ra·tion, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for imperforated

Historical Examples

  • This is clearly not the imperforated zizyphinus of the 'Systema.'

    The Journal of the Proceedings of the Linnean Society - Vol. 4


  • Its upright sides are imperforated, but top and bottom the usual perforation marks are present.

    Peeps at Postage Stamps

    Stanley Currie Johnson

British Dictionary definitions for imperforated


  1. not perforated
  2. (of a postage stamp) not provided with perforation or any other means of separationAbbreviation: imperf Compare perforate
  3. anatomy (of a bodily part, such as the anus) without the normal opening
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Derived Formsimperforation, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for imperforated



1670s, from im- + perforate (adj.).

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Online Etymology Dictionary, © 2010 Douglas Harper

imperforated in Medicine


  1. Lacking a normal opening.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.