para·cen·tric /-ˈsɛntrɪk/ 形容詞
 同臂內的,旁中心的
 par·a·cen·tric par·a·cen·tric·al a.  Deviating from circularity; changing the distance from a center.
 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.
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