·adj Acquired, as diseases; accidental.
II. Adventitious ·adj Out of the proper or usual place; as, adventitious buds or roots.
III. Adventitious ·adj Added extrinsically; not essentially inherent; accidental or causal; additional; supervenient; foreign.
IV. Adventitious ·adj Accidentally or sparingly spontaneous in a country or district; not fully naturalized; adventive;
— applied to foreign plants.