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Wiktionary
superminicomputer

n. (context computing English) A minicomputer that has a higher than normal performance, especially one using 32-bit rather than 16-bit words.

Wikipedia
Superminicomputer

A superminicomputer, or supermini, was “a minicomputer with high performance compared to ordinary minicomputers.” The term was an invention used from the mid-1970s mainly to distinguish the emerging 32-bit minis from the classical 16-bit minicomputers. The term is now largely obsolete but still remains of interest for students/researchers of computer history.