Source : Webster's Revised Unabridged Dictionary (1913)

Homoplasmy \Ho"mo*plas`my\, n. [Homo- + Gr. ? anything formed,
   fr. ? to form, mold.] (Biol.)
   Resemblance between different plants or animals, in external
   shape, in general habit, or in organs, which is not due to
   descent from a common ancestor, but to similar surrounding
   circumstances.