"The window is open."

Translation: Tha an uinneag fosgailte.

[AndrewBowm902648]

Why not an t-uinneag in this answer?

[phoenix7777777]

"uinneag is feminine so uses just an; masculine words use an t-. See the notes at https://www.duome.eu/tips/en/gd for all the ways to create a definite article."

https://forum.duolingo.com/comment/36577084

[Sandra509547]

Shouldn't it be an t-uinneag?

[Sandra509547]

Why not an t-uinneag?

[AndrewBowm902648]

Many thanks. I realised my mistake shortly after posting my query and felt rather foolish for not having checked the gender.
A.B.