Definition of double helix
: a helix or spiral consisting of two strands in the surface of a cylinder that coil around its axis
especially
: the structural arrangement of DNA in space that consists of paired polynucleotide strands stabilized by cross-links between purine and pyrimidine bases — compare alpha-helix, watson-crick model
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Merriam-Webster unabridged
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Time Traveler for double helix
The first known use of double helix was in 1954
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