double helix
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
From the M-W Editors
First Known Use of double helix
1954
DOUBLE HELIX Defined for English Language Learners
double helix
Definition of double helix for English Language Learners
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: the shape formed by two parallel lines that twist around each other
Medical Dictionary
double helix
Medical 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
Illustration of double helix
Learn More about double helix
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Britannica.com: Encyclopedia article about double helix
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