WordReference Random House Unabridged Dictionary of American English © 2026
ad•ven•tive
(ad ven′tiv),USA pronunciation [Bot., Zool.]
adj.
n.
ad•ven′tive•ly, adv.
adj.
- Botany, Zoologynot native and usually not yet well established, as exotic plants or animals.
n.
- Botany, Zoologyan adventive plant or animal.
- Latin advent(us) advance, incursion (see advent) + -ive
- 1595–1605, for an earlier sense