Akademik

Vestigial
Adjective describing something that is 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 a vestigial tail.
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Relating to a vestige.

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ves·tig·ial ve-'stij-(ē-)əl adj of, relating to, or being a vestige <a \vestigial structure>
ves·tig·ial·ly adv

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adj.
existing only in a rudimentary form. The term is applied to organs whose structure and function have diminished during the course of evolution until only a rudimentary structure exists.

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ves·tig·i·al (vəs-tijґe-əl) of the nature of a vestige, trace, or relic; rudimentary.

Medical dictionary. 2011.