adventitious(redirected from adventitious movements)
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(of a plant or animal part) developing in an abnormal position, as a root that grows from a stem
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
Also known as adventive.
Acquired spontaneously or accidentally, not by heredity.
Arising, as a tissue or organ, in an unusual or abnormal place.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.