heterotopism

from The Century Dictionary.

• noun Same as heterotopy.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Med.) A deviation from the natural position; -- a term applied in the case of organs or growths which are abnormal in situation.
• noun (Biol.) A deviation from the natural position of parts, supposed to be effected in thousands of years, by the gradual displacement of germ cells.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun biology heterotopy