heterotopism, n. [Hetero- + Gr. place: cf. F. hétérotopie.].
A deviation from the natural position; -- a term applied in the case of organs or growths which are abnormal in situation. [1913 Webster]
A deviation from the natural position of parts, supposed to be effected in thousands of years, by the gradual displacement of germ cells. [1913 Webster]