Saint Petersburg saint·pe·ters·burg uncommon noun 1. a city in western Florida on Tampa Bay; a popular winter resort SynonymsSt. PetersburgSaint Petersburg 2. a city in the European part of Russia; 2nd largest Russian city; located at the head of the Gulf of Finland; former capital of Russia SynonymsSt. PetersburgLeningradPeterburgPetrogradSaint Petersburg Related words Broader terms city Parts RussiaFlorida WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.