adventitious
adjective
ad·ven·ti·tious
ˌad-(ˌ)ven-ˈti-shəs
-vən-
1
: coming from another source and not inherent or innate
a Federal house without adventitious later additions
adventitious influences
2
: arising or occurring sporadically or in other than the usual location
adventitious roots
adventitiously
adverb
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Merriam-Webster unabridged
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