1. 
   Helicoidal
   Hel`i·coid'al adjective Same as Helicoid . -- Hel`i*coid'al*ly , adverb
   Found op http://www.encyclo.co.uk/webster/H/28
   
   
2. 
   Helicoidal
   • (a.) Same as Helicoid.
   Found op http://thinkexist.com/dictionary/meaning/helicoidal/
   
   
3. 
   helicoidal
   helicoidal 1 Forming or arranged in a spiral. 2 Having the form of a flat coil or flattened spiral. 3. Coiled or curving like a spiral. 4. In geometry, a warped surface generated by a straight line moving so as to cut or touch a fixed helix.
   Found op http://www.wordinfo.info/words/index/info/view_unit/962/
   
   

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