radikal

1. radical
   U mladosti je bio pravi radikal. — In his youth he was a real radical.
2. (of a political party) Radical; member of the Radical Party
   Radikali su ponovo izašli na izbore. — The Radicals ran in the elections again.
3. (in chemistry) radical
   Slobodni radikali oštećuju ćelije u telu. — Free radicals damage cells in the body.

In Serbia, radikali usually refers to members of the Serbian Radical Party.