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Biology (of parts, organs, etc.) vestigial; rudimentary
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
A part of an organism that is imperfect or indistinct, compared with a corresponding part of similar organisms.
No longer satisfactory for the purpose for which obtained, due to improvements or revised requirements.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.