The Collaborative International Dictionary of English v.0.48:

Excentric \Ex*cen"tric\, Excentrical \Ex*cen"tric*al\, a.
   1. Same as Eccentric, Eccentrical.
      [1913 Webster]

   2. (Bot.) One-sided; having the normally central portion not
      in the true center. --Gray.
      [1913 Webster]