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
Explore M-W
1954
First Known Use of double helix
1954
DOUBLE HELIX Defined for English Language Learners
double helix
Definition of double helix for English Language Learners
-
: 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
-
Britannica.com: Encyclopedia article about double helix
Seen and Heard
What made you want to look up double helix? Please tell us where you read or heard it (including the quote, if possible).
Writing? Check your grammar now!