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

  • noun Any of various tubular optical instruments that contain reflecting elements, such as mirrors and prisms, to permit observation from a position displaced from a direct line of sight.

from The Century Dictionary.

  • noun A general view or comprehensive summary. [Rare.]
  • noun 2. An instrument by which objects in a horizontal view may be seen through a vertical tube.
  • noun in photography, a photographic lens having a wide angle (90° or more).

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

  • noun rare A general or comprehensive view.

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

  • noun A form of viewing device that allows the viewer to see things at a different height level and usually with minimal visibility.
  • noun obsolete : A general or comprehensive view.
  • verb intransitive To rise and peer around, in the manner of a periscope.

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

  • noun an optical instrument that provides a view of an otherwise obstructed field


from Wiktionary, Creative Commons Attribution/Share-Alike License

From peri- + -scope.


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  • The only way is up.

    October 8, 2007

  • "Down periscope! Dive! Dive!" *aooga, aooga*

    October 9, 2007

  • So that's how you spell that sound!

    October 9, 2007

  • ...the parcel

    which now had a little window cut in it

    though which a tiny periscope had been

    insinuated establishing that

    the contents were four small pots of jam.

    - Peter Reading, Dr Cooper's Story, from Nothing for Anyone, 1977

    June 26, 2008