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NEILOID

Etymology: from Neile with the suffix oid.

 
Cylindrical equation: .
Cubic surface.

The neiloid is the surface of revolution obtained by rotating a semicubical parabola (or Neile parabola) around its axis of symmetry.
 
 
It is used in dendrometry to model the base of a tree trunk.
United States Forest Service (USDA FS)

 
 
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© Robert FERRÉOL 2017