Adventitious

Part of speech: adjective (a.)

1. Added extrinsically; not essentially inherent; accidental or causal; additional; supervenient; foreign. To things of great dimensions, if we annex an adventitious idea of terror, they become without comparison greater. Burke.

2. Out of the proper or usual place; as, adventitious buds or roots.

3. Accidentally or sparingly spontaneous in a country or district; not fully naturalized; adventive; -- applied to foreign plants.

4. Acquired, as diseases; accidental. -- Ad`ven*ti"tious*ly, adv. -- Ad`ven*ti"tious*ness, n.