This is the 10880th most frequent French word.
ouvrant
"Opening" or "movable part (e.g., door, window)."
Here, 'ouvrant' refers to the part of the window that opens, specifically the sash or opening part.
L'ouvrant de la fenêtre est cassé.
The window sash is broken.
In this context, 'ouvrant' is used as the present participle of the verb 'ouvrir', referring to the action of opening.
En tant qu'ouvrant la porte, il a aperçu ses amis.
As he was opening the door, he saw his friends.
Here, 'ouvrant' is a noun referring to a part designed to open, like a door, window, or panel.