folding door

noun
a door with hinged sections that can be folded flat against one another when opened.

Origin:
1605–15

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
folding door
 
n
a door in the form of two or more vertical hinged leaves that can be folded one against another

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Attach new folding door to acoustical plaster where structural modifications are not needed for support.
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