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helicoid


helicoid


  2  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Helicoid  \Hel"i*coid\,  a.  [Gr.  ?;  "e`lix,  -ikos,  spiral  +  ? 
  shape:  cf  F.  h['e]lico["i]de.  See  {Helix}.] 
  1.  Spiral;  curved,  like  the  spire  of  a  univalve  shell. 
 
  2.  (Zo["o]l.)  Shaped  like  a  snail  shell;  pertaining  to  the 
  {Helicid[ae]},  or  Snail  family. 
 
  {Helicoid  parabola}  (Math.),  the  parabolic  spiral. 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Helicoid  \Hel"i*coid\,  n.  (Geom.) 
  A  warped  surface  which  may  be  generated  by  a  straight  line 
  moving  in  such  a  manner  that  every  point  of  the  line  shall 
  have  a  uniform  motion  in  the  direction  of  another  fixed 
  straight  line  and  at  the  same  time  a  uniform  angular  motion 
  about  it