The Collaborative International Dictionary
Heteroplasm
Heteroplasm \Het"er*o*plasm\, n. [Hetero- + Gr. ? anything
formed or molded.]
An abnormal formation foreign to the economy, and composed of
elements different from those are found in it in its normal
condition.
--Dunglison.
Wiktionary
heteroplasm
n. (context pathology English) tissue growing in a part of the body where it does not normally occur.