/ Dictionary / Index F fleet ballistic missile submarine: Meaning and Definition of Find definitions for: fleet' ballis'tic mis'sile submarine" Pronunciation: [key] a nuclear submarine fitted with launchers to fire ballistic missiles either underwater or from the surface. Cf. SSBN Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. fleet admiral fleet-footed Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language