[ ad-vuh n-tish-uh s ]
/ ˌæd vənˈtɪʃ əs /


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.

Nearby words

  1. adventists,
  2. adventitia,
  3. adventitial,
  4. adventitial cell,
  5. adventitial neuritis,
  6. adventitious cyst,
  7. adventitious root,
  8. adventive,
  9. adventively,
  10. adventure

Origin of adventitious

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

Related forms Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for adventitious

British Dictionary definitions for adventitious


/ (ˌædvɛnˈtɪʃəs) /


added or appearing accidentally or unexpectedly
(of a plant or animal part) developing in an abnormal position, as a root that grows from a stem
Derived Formsadventitiously, adverb

Word Origin for adventitious

C17: from Latin adventīcius coming from outside, from adventus a coming

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for adventitious



"of the nature of an addition from without," c.1600, from Medieval Latin adventitius "coming from abroad, extraneous," a corruption of Latin adventicius "foreign, strange, accidental," from advent- past participle stem of advenire "arrive" (see advent). Related: Adventitiously; adventitiousness.

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for adventitious


[ ăd′vĕn-tĭshəs ]


Arising from an external source or occurring in an unusual place or manner; extrinsic.
Occurring accidentally or spontaneously, not caused by heredity.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.