" helical "

[Adjective]  | "he*li*cal" | \ ˈhe-li-kəl \

1: of, relating to, or having the form of a helix; broadly : spiral

Origin: 1591 ;

 Borrowed from New Latin helicālis, from Latin helic-, helix "spiral, {see: |helix|helix}" + -ālis {see: |-al:1|-al:1};

[Noun]  | "al*pha-he*lix" | \ ˌal-fə-ˈhē-liks \

1: the coiled structural arrangement of many proteins consisting of a single chain of amino acids stabilized by hydrogen bonds

Origin: 1951 ;

[Noun]  | "double helix" 

1: 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

Origin: 1954 ;

[Adjective]  | "helical"