sash window

World English Dictionary
sash window
 
n
a window consisting of two sashes placed one above the other so that one or each can be slid over the other to open the window

Collins English Dictionary - Complete & Unabridged 10th Edition
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WordNet
sash window

noun
a window with (usually two) sashes that slide vertically to let in air 
WordNet® 3.0, © 2006 by Princeton University.
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00:10
Sash window is always a great word to know.
So is flibbertigibbet. Does it mean:
a scrap or morsel of food left at a meal.
a chattering or flighty, light-headed person.
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