/ Dictionary / Index S sloop of war: Meaning and Definition of Find definitions for: sloop' of war' Pronunciation: [key] (formerly) a sailing or steam naval vessel having cannons on only one deck. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sloop sloop rig Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language