adventitious

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Related to adventitiously: adventitious root

adventitious

 [ad″ven-tish´us]
not normal to a part.

ad·ven·ti·tious

(ad-ven-tish'ŭs),
1. Arising from an external source or occurring in an unusual place or manner.
See also: extrinsic.
2. Occurring accidentally or spontaneously, as opposed to naturally or through heredity.
3. Synonym(s): adventitial

adventitious

/ad·ven·ti·tious/ (ad″ven-tish´us)
1. accidental or acquired; not natural or hereditary.
2. found out of the normal or usual place.

adventitious

(ăd′vĕn-tĭsh′əs, -vən-)
adj.
1. Arising from an external cause or factor; not inherent: "These rodents ... appear suddenly in the Oligocene, as if by adventitious entrance independent of the rest of the fauna" (George Gaylord Simpson).
2. Biology Of or belonging to a structure that develops in an unusual place: adventitious roots.

ad′ven·ti′tious·ly adv.
ad′ven·ti′tious·ness n.

adventitious

1 pertaining to an accidental condition or an arbitrary action.
2 not hereditary.
3 occurring at an inappropriate place, such as a coating on an artery.

ad·ven·ti·tious

(ad'vĕn-tish'ŭs)
1. Arising from an external source or occurring in an unusual place or manner.
See also: extrinsic
2. Occurring accidentally or spontaneously, as opposed to natural causes or hereditary.
3. Synonym(s): adventitial.

adventitious

1. Accidentally acquired or added by chance.
2. Occurring in an unusual place or in an irregular manner.

adventitious

  1. (of a root) growing laterally from a stem rather than the main root, e.g. prop roots of maize, clinging roots of climbing vines, and roots of BULBS, such as the daffodil.
  2. (of a bud) not developing in a leaf axil, as in Begonia where such buds can be produced from leaf wounds.

adventitious

formed after birth

ad·ven·ti·tious

(ad'vĕn-tish'ŭs)
1. Arising from an external source or occurring in an unusual place or manner.
2. Occurring accidentally or spontaneously, as opposed to naturally or through heredity.
3. Synonym(s): adventitial.

adventitious

1. accidental or acquired.
2. not in the usual place.

adventitious breath sounds
see breath sounds.
adventitious movements
purposeless movements; as seen in distemper myoclonus in dogs.
References in periodicals archive ?
Schmeiser himself was clearly an intentional infringer; though the seed may have entered adventitiously, when Schmeiser discovered the patented canola on his land, he intentionally selectively harvested the patented seed and used it in planting the next year's crop.
In the second part of the study, these researchers demonstrated the effects of content bias in these two instruments through a case study analysis of test results of the MMPI and MMPI-2 taken by a "normal," 31-year-old, adventitiously, legally blind male diagnosed with diabetic retinopathy at age 23 but sighted until that time.
One participant was congenitally visually impaired, and 8 were adventitiously visually impaired.
One argument is that responding on lever B increased because it was serving as a discriminative stimulus for responding that was adventitiously reinforced by a period of food-pellet reinforcement.
3); 4 were blind and 6 had low vision, and 2 were congenitally visually impaired and 8 were adventitiously visually impaired.
Because the sequence of intervals during the first VI session was adventitiously equal across FR history subjects (Table 2), the response-rate variability across those subjects could not be explained by the procedural differences across them.
2 years) who were totally blind (11 who were congenitally blind, and 2 who were adventitiously blind) provided informed consent under protocols approved by the University of Auckland Human Participant Ethics Committee.
If, however, a delay is imposed after each frame (postfeedback delay), rapid responding is not immediately followed by presentation of the next frame, and therefore will not be adventitiously reinforced.
Of the persons who worked in an industry associated with the National Industries for the Blind, those who were adventitiously blind were likely to earn just as much money, work just as many hours per week, and keep their jobs as long as employees who were congenitally blind (Crudden & Hanye, 1999).
During Trial 1, they responded randomly until they adventitiously used a correct solution.
But the results of their studies cannot be automatically generalized to people who are congenitally or adventitiously blind, since people who can see are still capable of using visual experience, visual memory, and visual imagery while they are blindfolded.
According to this view, immobility is adventitiously reinforced by shock offset and produces a competing response which transfers to the escape task.