— adventitiously , adv. — adventitiousness , n.
/ad'veuhn tish"euhs/ , adj.
1. associated with something by chance rather than as an integral part; extrinsic.
2. Bot. , Zool. appearing in an abnormal or unusual position or place, as a root.
[ 1595-1605; adventicius lit., coming from without, external, equiv. to ad- AD- + ven- (s. of venire to come) + -t ( us ) ptp. suffix + -icius -ITIOUS ]