from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Having no opening; not perforated.
  • adjective Not separated by rows of perforations.
  • adjective Medicine Lacking a normal opening.
  • noun An imperforate stamp.

from The Century Dictionary.

  • 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.
  • Not perforated; having no perforations, foramina, or pores; atresial; in zoology, specifically, of or pertaining to the Imperforata.

from the GNU version of the Collaborative International Dictionary of English.

  • adjective Not perforated; having no opening or aperture.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective Not perforated.
  • noun philately A postage stamp that has not been perforated.

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

  • adjective 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