/ Dictionary / Index R rucksack: Meaning and Definition of Find definitions for: ruck•sack Pronunciation: (ruk'sak", rook'-), [key] — n. a type of knapsack carried by hikers, bicyclists, etc. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: rucksack (Thesaurus) ruck ruckus Related Content Daily Word Quiz: nonchalant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language