associated with something by chance rather than as an integral part; extrinsic.
Botany, Zoology. appearing in an abnormal or unusual position or place, as a root.

1595–1605; < Latin adventīcius literally, coming from without, external, equivalent to ad- ad- + ven- (stem of venīre to come) + -t(us) past participle suffix + -īcius -itious

adventitiously, adverb
adventitiousness, noun
nonadventitious, adjective
nonadventitiously, adverb
nonadventitiousness, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
adventitious (ˌædvɛnˈtɪʃəs)
1.  added or appearing accidentally or unexpectedly
2.  (of a plant or animal part) developing in an abnormal position, as a root that grows from a stem
[C17: from Latin adventīcius coming from outside, from adventus a coming]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

"of the nature of an addition from without," c.1600, from M.L. adventitius "coming from abroad, extraneous," a corruption of L. adventicius "coming from abroad, extraneous, foreign," from adventum, pp. of advenire "arrive" (see advent).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

adventitious ad·ven·ti·tious (ād'věn-tĭsh'əs, -vən-)

  1. Arising from an external source or occurring in an unusual place or manner; extrinsic.

  2. Occurring accidentally or spontaneously, not caused by heredity.

  3. Adventitial.

ad'ven·ti'tious·ly adv.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
These climbing roots are adventitious; that is, they do not arise from the
  young root of the germinating seed.
The poem obtained adventitious fame.
Stilt roots are adventitious roots that grow out of the main trunk, a yard or
  so above the ground.
This would be sacrificing the essential to the adventitious with a vengeance.
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