Could you please explain the word ´önündür´ to me? What does it mean and how is it formed?

My try as learner, I am not sure this is correct:

ön (front/in front/preliminary/primary)-ün (genitive case)-dür (suffix dür)

I think the meaning may be ´from the front´, or may be ´at first´..... please wait for people more knowledgeable here.

I Tried to help anyway (in this way, I´ll also learn!).

 "Önündür" means this is your front.

without dots "onundur" means "it is his/hers"; but "-dir" suffix is not used commonly, and sometimes it gives a meaning of possibility. i.e. it is possibly his/hers

e.g.

- bu kimin kitabı? (who is book is that?)

- (pointing at someone) onundur. (probably it is hers)