Pedal surface


  • Webster's Revised Unabridged Dictionary
    • Pedal surface (Geom) the curve or surface which is the locus of the feet of perpendiculars let fall from a fixed point upon the straight lines tangent to a given curve, or upon the planes tangent to a given surface.
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In literature:

When attached it moves freely over the surface on its pedal disk.
"Marine Protozoa from Woods Hole" by Gary N. Calkins