Webster's English Dictionary

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helix

he.lix \'he--liks\ \'hel-*-.se-z, 'he--l*-\ \'he--lik-s*z\ n or he.li.ces 
   also he.lix.es [L, fr. Gk; akin to Gk eilyein to roll, wrap - more at 
   VOLUBLE] pl  1: something spiral in form : as  1a: an ornamental volute  
   1b: a coil formed by winding wire around a uniform tube  2: the incurved 
   rim of the external ear  3: a curve traced on a cylinder by the rotation of 
   a point crossing its rig ht sections at a constant oblique angle; broadly : 
   SPIRAL