Word Definition

Adventitious

  1. Added extrinsically; not essentially inherent; accidental or causal; additional; supervenient; foreign.
  2. Out of the proper or usual place; as, adventitious buds or roots.
  3. Acquired, as diseases; accidental.
  4. Accidentally or sparingly spontaneous in a country or district; not fully naturalized; adventive; -- applied to foreign plants.

Antonyms