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Diametral surface

Source : Webster's Revised Unabridged Dictionary (1913)

Diametral \Di*am"e*tral\, a. [Gr. F. diam['e]tral.]
   Pertaining to a diameter; diametrical.

   {Diametral curve}, {Diametral surface} (Geom.), any line or
      surface which bisects a system of parallel chords drawn in
      a curve or surface.

   {Diametral planes} (Crystal.), planes in which two of the
      axes lie.
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