The Archimedes-class was a type of starship in service with the Federation Starfleet in the 24th century. At least one ship of the class, the USS Erdös, was operating near the B'hava'el star system in the year 2378.
The Archimedes-class used, or could be retro-fitted with, the same type of warp core utilised by Defiant-class ships. (DS9 novel: Ascendance)