adventitious

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Related to adventitious movements: ataxia, snout reflex, Adventive root

adventitious

(of a plant or animal part) developing in an abnormal position, as a root that grows from a stem

adventitious

[‚ad·ven′tish·əs]
(biology)
Also known as adventive.
Acquired spontaneously or accidentally, not by heredity.
Arising, as a tissue or organ, in an unusual or abnormal place.