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Biology Vestigial or rudimentary, especially in comparison with related or ancestral species, as the tailbone of an ape. Used of an organ or other part of an organism.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
obsoleteoutdated, or no further use, gradually disappearing.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005