ec·cen·tric 
(ĭk-sĕntrĭk, ĕk-)
(ĭk-sĕntrĭk, ĕk-)adj.
1. Departing from a recognized, conventional, or established norm or pattern. See Synonyms at strange.
2. Deviating from a circular form or path, as in an elliptical orbit.
3.
a. Not having the same center: eccentric circles.
b. Having the axis located elsewhere than at the geometric center.
n.
1. One that deviates markedly from an established norm, especially a person of odd or unconventional behavior.
2. Physics A disk or wheel having its axis of revolution displaced from its center so that it is capable of imparting reciprocating motion.
[Middle English eccentrik, planetary orbit of which the earth is not at the center, from Medieval Latin eccentricus, not having the same center, from Greek ekkentros : ek-, out of; see ECTO- + kentron, center (from kentein, to prick; see kent- in the Appendix of Indo-European roots).]
ec·centri·cal·ly adv.
eccentriceccentric circles with the center of each circle marked