specijalizirati

1. Croat. (specijalizirati se za + acc.) to specialize
   Ova firma se specijalizirala za izradu web stranica. — This company has specialized in building websites.
   Specijalizirao se za kardiologiju. — He specialized in cardiology.
2. Croat. (of doctors) to do a residency in; to specialize in
   Ana specijalizira pedijatriju u Zagrebu. — Ana is doing a residency in pediatrics in Zagreb.

In Serbia the word is specijalizovati (se).