adventitious
 ad·ven·ti·tious (ăd'vĕn-tĭshʹəs, -vən-)adj.
1. Not inherent but added extrinsically. See Synonyms at accidental.
2. Biology. Of or belonging to a structure that develops in an unusual place:
adventitious roots. [From Latin adventīcius, foreign, from adventus, arrival. See advent.] ad'ven·tiʹtious·ly adv.ad'ven·tiʹtious·ness n.
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