double helix

noun Biochemistry, Genetics.
the spiral arrangement of the two complementary strands of DNA.

Origin:
1953; term introduced by J.D. Watson and F.H.C. Crick

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Collins
World English Dictionary
double helix
 
n
biochem the form of the molecular structure of DNA, consisting of two helical polynucleotide chains linked by hydrogen bonds and coiled around the same axis

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

double helix n.
The coiled structure of a double-stranded DNA molecule in which strands linked by hydrogen bonds form a spiral configuration. Also called DNA helix, Watson-Crick helix.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
double helix  
The three-dimensional structure of double-stranded DNA, in which polymeric nucleotide strands whose complementary nitrogen bases are linked by hydrogen bonds form a helical configuration. The two DNA strands are oriented in opposite directions.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
double helix [(hee-liks)]

The shape taken by the DNA molecule. A helix is a three-dimensional spiral, like the shape of a spring or the railing on a spiral staircase. A DNA molecule consists of two helixes intertwined.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
They didn't give her credit for her photographs that they took of the double
  helix.
It's made up of two matching spirals, known as the double helix.
Chemicals are then added and the temperature is lowered, allowing each strand
  to replicate itself and form a new double helix.
Their structure--an elegant double helix--almost merited such enthusiasm.
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