window envelope

noun
an envelope with a transparent opening through which the address on the enclosure may be read.

Origin:
1915–20

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
window envelope
 
n
a type of envelope, esp for business use, having a transparent area that reveals the address within

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
The address will be displayed appropriately in a left window envelope.
Address an envelope to the claimant and supply a window envelope for the
  representative's copy of the letter and decision.
The name and address information you provide here will be shown on the check
  and will be seen through the window envelope.
If mailed back to you, this is the address that will appear in the window
  envelope.
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