minicomputer

[min-ee-kuh m-pyoo-ter] /ˈmɪn i kəmˌpyu tər/
noun
1.
a computer with processing and storage capabilities smaller than those of a mainframe but larger than those of a microcomputer.
Origin
1965-70; mini- + computer
British Dictionary definitions for minicomputers

minicomputer

/ˌmɪnɪkəmˈpjuːtə/
noun
1.
a small comparatively cheap digital computer