french window
Noun
Meaning
a French door situated in an exterior wall of a building
Source: WordNetHypernyms
Examples
Prosecutors said the robber entered the exhibition room through a French window that opened onto a terrace, which itself looks onto the popular Croisette avenue in Cannes.
It is called a French window when used in a pair as double-leaved doors with large glass panels in each door leaf, and in which the doors may swing out (typically) as well as in. A Mead door, developed by S Mead of Leicester, swings both ways.
Old double French doors (6 lites each), with hinges on the exterior, they must open outward; it is uncertain whether there is a central mullion, without which it could be called a French window albeit not being typical.