I. bə̇ˈsīdz, bē- adverb
Etymology: Middle English, adverb & preposition, from beside + -s
1.
a. : in addition : over and above
possessing a wealth of printed material and many original manuscripts besides
b. : moreover , furthermore
the play is excellent, and besides the tickets cost very little
2. : otherwise , else
knows the rules of grammar, but very little besides
II. preposition
Etymology: Middle English
1. : in addition to
besides being a model of scholarly thoroughness, the biographical chapters are vivid and engrossing — C.J.Rolo
2. : other than : except
there's nothing you can do besides making the best of the situation