Ad'ven-tī'tious, a.
(-tĭsh'ŭs), a. 1. Added extrinsically; not essentially inherent; accidental; casual; additional; supervenient; foreign.
To things of great dimensions, if we annex an adventitious idea of terror, they become without comparison greater. Burke.
Sense 2. (Bot.) Out of the proper or usual place; as, adventitious buds. Gray.
Sense 3. (Med.) Not hereditary or congenital, but acquired, as certain diseases.