/ ˈsuːpəfaɪn; ˈsjuː-; NAmE ˈsuːpərf-/ adjective ( technical )
1.
extremely light or thin; made of extremely small pieces :
superfine fibres
superfine powder
2.
of extremely good quality :
superfine cloth
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WORD ORIGIN
late 16th cent. (in the sense excessively elegant ): from super- to a high degree + the adjective fine .