vestigial Definition

vestige
noun

1. A slight amount; a hint or shred.

Thesaurus: trace, sign, hint.
2. A surviving trace of what has almost disappeared.

Thesaurus: trace, relic, remains, residue, evidence, track, clue, remainder, telltale sign.
3. biol.
A small functionless part in an animal or plant, once a fully developed organ in ancestors.

Derivative: vestigial
adj

Etymology: 17c: from Latin vestigium footprint.