/ Dictionary / Index D double helix: Meaning and Definition of Find definitions for: dou'ble he'lix Pronunciation: [key] — Biochem.,Genetics. Biochem.,Genetics. the spiral arrangement of the two complementary strands of DNA. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. double-helical gear double hitch Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language