gymnasium
Pronunciation: /dʒɪmˈneɪzɪəm/
noun ( plural gymnasiums or gymnasia /-zɪə/)

Derivatives

Origin:
late 16th century: via Latin from Greek gumnasion, from gumnazein 'exercise naked', from gumnos 'naked'

Spelling help
The plural of gymnasium can be spelled either gymnasia (as in the original Latin) or gymnasiums.