Good. You can consult an English-English dictionary as well.

Besides can be either a preposition or a adverbe.

The following is from the on-line WM Dictionary:

http://www.merriam-webster.com/dictionary/besides?show=0&t=1357792369

 

be·sides preposition \bi-ˈsīdz, bē-\

Definition of BESIDES

1

: other than, except <no one besides us>

2

: together with <a decision that, besides being practical, is morally right>

See besides defined for English-language learners »

See besides defined for kids »

Examples of BESIDES

1. She wants to learn other languages besides English and French.
2. Besides its famous cakes, the bakery also makes delicious breads and cookies.
3. These salads are delicious besides being healthy.
4. I'm not ready to get married yet. Besides which, I enjoy living alone.

²besides

adverb

Definition of BESIDES

1

: as well : also

2

: moreover, furthermore

See besides defined for English-language learners »

Examples of BESIDES

1. They serve pasta and many other foods besides.
2. I'm not ready to get married yet. Besides, I enjoy living alone.