A door with glass panels, such as a sliding glass door or a French door. Common in homes, shops, and public buildings.
I opened the glass door and went out onto the balcony.
The business hours are posted on the shop's glass door.
Since it was hot, I opened the glass door to let the breeze in.
The glass door shattered due to the strong wind.
I looked at the flowers in the garden through the glass door.