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An adjustable opening for radiation to enter or exit an optical instrument.

Synonyms and Related Terms

blænde (Dan.); Blende (Deut.); ouverture (Fr.); diafragma (Ned.); apertura (Pol.); bländare (Sven.)

Resources and Citations

  • Walter C. McCrone, John Gustave Delly, The Particle Atlas, W. McCrone Associates, Chicago, IV, 1972
  • Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
  • Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
  • The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998