/ Dictionary / Index A alpha helix: Meaning and Definition of Find definitions for: al'pha he'lix Pronunciation: [key] — Biochem. Biochem. the rodlike spatial configuration of many protein molecules in which the polypeptide backbone is stabilized by hydrogen bonds between amino acids in successive helical turns. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. alpha globulin alpha-interferon Related Content Daily Word Quiz: nefarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language