The Etymology of Helix
Greek helix meant any spiral or coiling thing — a tendril, a snail shell, the curl of a wave. The word entered English in the 16th century as a mathematical and architectural term, but its modern fame rests on Watson and Crick's 1953 description of DNA's double helix structure. The Greek source verb helissein ('to turn, to wind') connects to PIE *wel- ('to turn'), the same root behind Latin volvere and English revolve, volume, and evolve. A less obvious descendant is helicopter, which is not heli-copter but helico-pter: helix ('spiral') plus pteron ('wing'). In anatomy, the helix is the curved outer rim of the ear, named for its spiral fold. French and Spanish use hélice for both the geometric shape and a propeller — making the connection between spinning and spiralling explicit.