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

: adventitial

3

: not congenital <adventitious deafness>

—ad·ven·ti·tious·ly adverb