nhomoplasyThe quality of being homoplastic; agreement in form and structure without community of origin, as of organs or parts of two different organs: opposed to homogeny: correlated with analogy or heterology as distinguished from homology in biological senses. The conceptions expressed by the terms homoplasy and homogeny are little different from those for which analogy and homology were earlier and more widely used, as in such a familiar instance as that of the wing of the bat being analogous to the wing of the butterfly and homologous with the fore leg of a horse. But the conceptions now rest upon evolutionary considerations, and are more precisely predicable, as when an organ of one animal may be similar in form as well as function to that of another, and hence homoplastic, though having a different origination, and hence not homogenetic. See extract under homoplastic.
Webster's Revised Unabridged Dictionary
Homo-, + Gr. to form, mold
Serial homology, for instance, was a case of homoplasy.
"Form and Function" by E. S. (Edward Stuart) Russell