from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Having no opening; not perforated.
  • adj. Not separated by rows of perforations: imperforate sheets of stamps.
  • adj. Medicine Lacking a normal opening: an imperforate anus.
  • n. An imperforate stamp.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Not perforated.
  • n. A postage stamp that has not been perforated.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Not perforated; having no opening or aperture.

from The Century Dictionary and Cyclopedia

  • Not perforated; having no perforations, foramina, or pores; atresial; in zoology, specifically, of or pertaining to the Imperforata.
  • As applied to the shells of the gastropod Mollusca, having the inner parts of the whorls coalesced into a columella leaving no opening or perforation. In the Echinoidea, or sea-urchins, the mamelons which support the spines are imperforate when not pierced by a central foramen.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. not perforated; having no opening


Sorry, no etymologies found.



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  • In stamp collecting: without perforations or rouletting between the individual stamps in a pane. The earliest stamps were imperforate by design, but after about 1860 most stamps were perforated. Modern imperforates are usually errors or are produced specifically for sale to stamp collectors.

    August 25, 2008