[for.tress] n [ME forteresse, fr. MF forteresce, fr. ML fortalitia, fr. L fortis strong] (14c): a fortified place: stronghold; esp: a large and permanent fortification sometimes including a town -- for.tress.like adj
FORTRESS
Meaning of FORTRESS in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012