Home › Words › M › micromainframemicromainframemicromainframe · noun — A computer resembling a mainframe but significantly smaller in physical size.Definition from Wiktionary (CC BY-SA 3.0).EtymologyFrom micro- + mainframe.nounA computer resembling a mainframe but significantly smaller in physical size.Definitions & examples from Wiktionary (CC BY-SA 3.0).