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window envelope

American

noun

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

window envelope British

noun

a type of envelope, esp for business use, having a transparent area that reveals the address within

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of window envelope

First recorded in 1915–20

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023