obsolescent

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obsolescent

(ŏb′sə-lĕs′ənt)
adj.
Biology Becoming reduced during the course of evolution; vestigial or nearly vestigial. Used of an organ or other part of an organism.

ob′so·les′cence n.
ob′so·les′cent·ly adv.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.