Ad`ven*ti"tious (#), a. [L. adventitius.]
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.
2. Nat. Hist.
Out of the proper or usual place; as, adventitious buds or roots.
Accidentally or sparingly spontaneous in a country or district; not fully naturalized; adventive; -- applied to foreign plants.
Acquired, as diseases; accidental.
-- Ad`ven*ti"tious*ly, adv. -- Ad`ven*ti"tious*ness, n.
© Webster 1913.