/ Dictionary / Index C complementary strand: Meaning and Definition of Find definitions for: com'plemen'tary strand' Pronunciation: [key] — Biochem. Biochem. either of the two chains that make up a double helix of DNA, with corresponding positions on the two chains being composed of a pair of complementary bases. a section of one nucleic acid chain that is bonded to another by a sequence of base pairs. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. complementary distribution complementation Related Content Daily Word Quiz: wary Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language