Extended Strong's Greek Lexicon (Abbott-Smith based)
Pergamum
Usage: Πέργαμος, -ου, ἡ (so Xen., Paus., al., but -ον, τό in Strabo, Polyb., and most writers, also in Inscr.; in NT the termination is uncertain) Pergamum, a city of Mysia: Rev.1:11 2:12.† (AS)