adventitious
ad·ven·ti·tious
adj \-əs\Definition of ADVENTITIOUS
1
a : arising sporadically or in other than the usual location <an adventitious part in embryonic development> b : occurring spontaneously or accidentally in a country or region to which it is not native <an adventitious insect>
2
3
: not congenital <adventitious deafness>
—ad·ven·ti·tious·ly adverb
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