IPA: /ˈaʊtˌɡroʊθ/
KK: /aʊtˌɡroʊθ/
A part that grows out from something else, often as a result or consequence of a process.
The new branch is an outgrowth of the tree's healthy growth.
Outgrowth is formed from "out-" (meaning outside or outward) and "growth" (from Old English "growan", meaning to grow). The word describes something that grows outward or develops from a source.
Think of something that is growing 'outward' ('out-') from a source — that's what outgrowth means.