IPA: /ˌsɪnəˈmætɛk/
KK: /ˌsɪnəˈmætɛk/
A small theater that shows classic or experimental films, often focusing on art-house cinema.
We decided to visit the local cinematheque to watch a classic film from the 1960s.
Cinematheque is formed from "cinema" (from French *cinéma*, meaning motion picture or film) and "-theque" (from Greek *thēkē*, meaning repository or place for storing). The word refers to a place where films are stored and shown, essentially a film library or archive.
Think of a 'repository' ('-theque') for 'motion pictures' ('cinema') — that's what a cinematheque is, a place where films are kept and displayed.
No commonly confused words.