paracentrical

paracentric par`a*cen"tric (p[a^]r`[.a]*s[e^]n"tr[i^]k), paracentrical par`a*cen"tric*al (p[a^]r`[.a]*s[e^]n"tr[i^]*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]