[ im-pur-fer-it, -fuh-reyt ]
/ ɪmˈpɜr fər ɪt, -fəˌreɪt /


Also im·per·fo·rat·ed. not perforate; having no perforation.
Philately. (of a number of stamps joined together) lacking the perforations usually separating individual stamps.


an imperforate stamp.

Nearby words

  1. imperfect fungus,
  2. imperfect stage,
  3. imperfectible,
  4. imperfection,
  5. imperfective,
  6. imperforate anus,
  7. imperforation,
  8. imperia,
  9. imperial,
  10. imperial beach

Origin of imperforate

First recorded in 1665–75; im-2 + perforate

Related formsim·per·fo·ra·tion, noun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for imperforate

British Dictionary definitions for imperforate


/ (ɪmˈpɜːfərɪt, -ˌreɪt) /


not perforated
(of a postage stamp) not provided with perforation or any other means of separationAbbreviation: imperf Compare perforate
anatomy (of a bodily part, such as the anus) without the normal opening
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 imperforate



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

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for imperforate


[ ĭm-pûrfər-ĭt ]


Lacking a normal opening.

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