The Collaborative International Dictionary of English v.0.48:

Mimetic \Mi*met"ic\ (?; 277), Mimetical \Mi*met"ic*al\, [Gr. ?,
   fr. ? to imitate.]
   [1913 Webster]
   1. Apt to imitate; given to mimicry; imitative.
      [1913 Webster]

   2. (Biol.) Characterized by mimicry; -- applied to animals
      and plants; as, mimetic species; mimetic organisms. See
      Mimicry.
      [1913 Webster]