| Noun | 1. | Rostock - a city in northeastern Germany near the Baltic sea; an important member of the Hanseatic League in the 14th centuryHanseatic League - a commercial and defensive confederation of free cities in northern Germany and surrounding areas; formed in the 13th century and most powerful in the 14th century city, metropolis, urban center - a large and densely populated urban area; may include several independent administrative districts; "Ancient Troy was a great city" | |