This is the 8667th most frequent Turkish word.
rüzgarın
"Of the wind" or "the wind's."
The word "rüzgarın" is used here in the possessive form to indicate that the wind owns the strength being described.
Rüzgarın şiddeti pencereleri zorladı.
The wind's strength strained the windows.
In this instance, "rüzgarın" indicates possession, specifically referring to the direction belonging to the wind.
Rüzgarın yönüne göre yelken açmalıyız.
We must set the sails according to the wind's direction.
Here, "rüzgarın" shows possession, referring to the sound that originates from the wind.