/ Dictionary / Index M minisub: Meaning and Definition of Find definitions for: min•i•sub Pronunciation: (min'ē-sub"), [key] — n. a small submarine, holding only one or a few persons, used in naval operations, underwater exploration, or conducting underwater experiments. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: minisub (Thesaurus) ministry mini-tower Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language