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Webster 1913 Edition

Noun.

That which grows out of, or proceeds from, anything; an excrescence; an offshoot; hence, a result or consequence.

outgrowth ‎(plural outgrowths)

Anything that grows out of something else.
1. A branch or offshoot of a plant.
2. An appendage of an animal.
3. A byproduct or consequence of an action or event.