Function: noun
Date: 1954
: 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
– dou · ble-he · li · cal \ - ' he-li-k ə l, - ' h ē - \ adjective