/ Dictionary / Index R restriction fragment: Meaning and Definition of Find definitions for: restric'tion frag"ment Pronunciation: [key] a length of DNA cut from the strand by a restriction enzyme. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. restriction enzyme restrictionism Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language