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[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.
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
adventitiously, adverb
adventitiousness, noun
nonadventitious, adjective
nonadventitiously, adverb
nonadventitiousness, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for adventitious
Historical Examples
  • Wordsworth was determined to owe nothing to such an adventitious cause.

    A Dish Of Orts George MacDonald
  • There was no sting in their poverty; no adventitious misery belonging to it.

    Deerbrook Harriet Martineau
  • Formation of adventitious flowers and fruits within the ovary.

    Vegetable Teratology

    Maxwell T. Masters
  • By Morren this production of adventitious spurs was called "Ceratomanie."

    Vegetable Teratology

    Maxwell T. Masters
  • Not, indeed, that these depended on adventitious aids to remembrance.

  • Nevertheless the picture that tells a story calls in adventitious aid.

    Beauty and the Beast Stewart A. McDowall
  • But it was not adventitious; it was the logical outcome of his status as god of growth.

  • Let me make this experiment, with no adventitious help of patronage or introduction.

    Merkland Mrs. Oliphant
  • Now that we've settled that point, let's divide the adventitious circumstances.

    The Long Chance Peter B. Kyne
  • The like affections, natural and adventitious, in all such things do happen.

British Dictionary definitions for adventitious


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 Forms
adventitiously, adverb
Word Origin
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
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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
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adventitious in Medicine

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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