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Webster 1913 Edition

Noun.

[

Hetero-

+ Gr. [GREEK] 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.

heteroplasm ‎(plural heteroplasms)

(pathology) Tissue growing in a part of the body where it does not normally occur.