organizam

1. (of a person) body; system
   Organizmu je potrebno dosta vode. — The body needs plenty of water.
   Njegov organizam se brzo oporavio. — His body recovered quickly.
2. organism
   Bakterije su jednoćelijski organizmi. — Bacteria are single-celled organisms.
3. formal organism; system
   Grad je živ organizam koji se stalno menja. — A city is a living organism that constantly changes.

When talking about health, organizam often simply means 'the body'.