ETYM Latin adventitius.
Accidental; casual.
Medicine, Botany, added from without; not essential; accidental; casual; acquired; adventive.
In botany, arising in an abnormal position, as in roots developing on the stem of a cutting or buds developing on roots.
1. Added extrinsically; not essentially inherent; accidental or causal; additional; supervenient; foreign.
2. Out of the proper or usual place.
3. Accidentally or sparingly spontaneous in a country or district; not fully naturalized; adventive.
4. Acquired, as diseases; accidental.
5. Associated by chance and not an integral part