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-ssociated 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.
historical examples

such acknowledgments are of high value in keeping the issue clear, if not always of all advent-tious, yet of all venomous matter.
the works of robert g. ingersoll, vol. 6 (of 12) robert g. ingersoll

there was no sting in their poverty; no advent-tious misery belonging to it.
deerbrook harriet martineau

the changes now detected in response are therefore due to no advent-tious circ-mstance, but to the reagent itself.
response in the living and non-living jagadis chunder bose

formation of advent-tious flowers and fruits within the ovary.
vegetable teratology maxwell t. masters

in relating it i have delivered “a round, unvarnished tale,” and have not colored the truth with any advent-tious hue of fancy.
the haunted homestead e. d. e. n. southworth

democritus says that dreams are formed by the illapse of advent-tious representations.
essays and miscellanies plutarch

the trees themselves teach him to scorn his master’s advent-tious claim to exclusive ownership.
the centralia conspiracy ralph chaplin

but the book which he has translated possesses, besides these advent-tious claims to respect, a supreme intrinsic value.
vondel’s lucifer joost van den vondel

hence the recourse to advent-tious leverage to push it in, to fact-tious drill to drive it in, to artificial bribe to lure it in.
the child and the curriculum john dewey

he was more so than columbus, and rendered the advent-tious career of the genoese possible.
christopher columbus and how he received and imparted the spirit of discovery justin winsor

adjective
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
adj.

“of the nature of an addition from without,” c.1600, from medieval latin advent-tius “coming from abroad, extraneous,” a corruption of latin adventicius “foreign, strange, accidental,” from advent- past participle stem of advenire “arrive” (see advent). related: advent-tiously; advent-tiousness.

advent-tious ad·ven·ti·tious (ād’věn-tĭsh’əs, -vən-)
adj.

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

occurring accidentally or spontaneously, not caused by heredity.

advent-tial.

ad’ven·ti’tious·ly adv.