What does ウィンドウ mean?
ウィンドウ is a Japanese noun meaning “window” in English. It is written as ウィンドウ in hiragana, and uindou in romaji. This word is part of JLPT N2 vocabulary.
Example sentence
右上にある「バッテン」のボタンが、ウィンドウを消すボタンだよ。
The "X" button in the top right shuts the window.