[1] : The Collaborative International Dictionary of English v.0.48

paracentric \par`acen"tric\ pa^r`.ase^n"tri^k,
paracentrical \par`acen"trical\
   pa^r`.ase^n"tri^kal, a. pref. para- + centric,
   -ical: cf. f. paracentrique.
   deviating from circularity; changing the distance from a
   center.
   1913 webster

   paracentric curve math., a curve having the property
      that, when its plane is placed vertically, a body
      descending along it, by the force of gravity, will
      approach to, or recede from, a fixed point or center, by
      equal distances in equal times; -- called also a
      paracentric.

   paracentric motion or paracentric velocity, the motion or
      velocity of a revolving body, such as a planet, by which
      it approaches to, or recedes from, the center, without
      reference to its motion in space, or to its motion as
      reckoned in any other direction.
      1913 webster
see also:
paracentric curve paracentric paracentric motion paracentric velocity 

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