prsni

1. chest; pectoral
   Udario se i slomio rebro u prsnom košu. — He hit himself and broke a rib in his rib cage.
   Trener mi je pokazao vežbe za prsne mišiće. — The trainer showed me exercises for the chest muscles.
2. (of swimming) breaststroke
   Najviše volim prsno plivanje. — I like the breaststroke best.

Mostly used in set terms: prsni koš "rib cage", prsno plivanje "breaststroke".