sash window 
noun
A window with one or two sashes which can be slid vertically to make an opening.This beautifully proportioned room spans the width of the house and has views over the square through a deep bay window and a shuttered sash window....
- I had already been to bed and found it impossible to sleep, despite having the sash window entirely open.
- A large sash window and a fanlight ensure that plenty of light filters through.
- portional
- portionary
- portion control
- portion-controlled
- portioner
- portionist
- portionless
- portion money
- portière
- portièred
- Port Jackson
- Port Jackson willow
- Portland
- Portland arrowroot
- Portland beds
- Portland cement
- Portlandian
- Portland, Isle of
- portlandite
- Portland limestone
- Portland oolite
- Portland Place
- Portland sago
- Portland sand
- Portland screw