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Definition of Vestigial

Vestigial: Referring to a vestige (remnant) or a primitive structure and no longer believed to be important. For example, the appendix is considered a vestigial organ, and some infants are born with vestigial tails.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=11555
Last Editorial Review: 3/19/2012

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