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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. 

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© Robert FERRÉOL 2017