[ve-stij-ee-uhl, -stij-uhl]
of, pertaining to, or of the nature of a vestige: a vestigial tail.

1880–85; < Latin vestīgi(um) vestige + -al1

vestigially, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
vestigial (vɛˈstɪdʒɪəl)
1.  of, relating to, or being a vestige
2.  (of certain organs or parts of organisms) having attained a simple structure and reduced size and function during the evolution of the species: the vestigial pelvic girdle of a snake

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1877, from vestige (q.v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

vestigial ves·tig·i·al (vě-stĭj'ē-əl, -stĭj'əl)
Occurring or persisting as a rudimentary or degenerate structure.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
vestigial   (vě-stĭj'ē-əl)  Pronunciation Key 
Relating to a body part that has become small and lost its use because of evolutionary change. Whales, for example, have small bones located in the muscles of their body walls that are vestigial bones of hips and hind limbs.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The buttons and knobs are still there, but they are vestigial.
Solitude is almost a vestigial pleasure, now that electronic entertainment can
  accompany us anywhere.
In fact, the vestigial atmosphere is still slowly dissipating into space.
The now vestigial cord can be wrapped around the base.
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