jezgro

1. nucleus; core
   Zemljino jezgro je veoma vrelo. — The Earth's core is very hot.
   Ovaj procesor ima osam jezgara. — This processor has eight cores.
2. heart; essence; core
   To je jezgro celog problema. — That's the heart of the whole problem.
   Jezgro tima ostaje isto. — The core of the team stays the same.
3. (of fruit) kernel
   Za kolač ti treba sto grama jezgra oraha. — For the cake you need a hundred grams of shelled walnuts.