n :  a helix or spiral consisting of two strands in the surface of a cylinder that coil around its axis : esp  :  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  dou*ble-he*li*cal adj 
 
 
 
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