Pergamos = "height or elevation"
1) a city of Mysia Minor, in Asia Minor, the seat of the dynasties of Attalus and Eumenes, famous for its temple of Aesculapius and the invention and manufacture of parchment. The river Selinus flowed through it and the Cetius ran past it. It was the birthplace of the physician Galen, and had a great royal library. It had a Christian church.
Part of Speech: noun proper locative
From G4444; fortified; Pergamus, a place in Asia Minor: - Pergamos.
These two sites give similar information, with the definition from several dictionaries and statistics on the use of the word.
Perseus Digital Library
University of Chicago's Logion lexicon
Thayer's dictionary plus other information.
From this site's dictionary (in Italian)
Click on the first column to search for that word as a form of the root Πέργαμος; click on the second column to search for that grammatical form of the root Πέργαμος; click on the third column to search for that word and grammatical form; click on the total to search for the root Πέργαμος.