Vestigial a. : Of or pertaining to a vestige or remnant; like a vestige.

Example:
if an animal has a Vestigial structure, what might a biologist infer about the anuimal's evolutionary history?

Taxonomy
vestigial, vestigial structures, species, Vestigiality, Darwin, organ, evolution, organism, humans, vestiges, vestigial organs, remnants, vestigial structure, animals, ancestors, London, characters, rudimentary.

Defination from the web:
vestigial structures, though the term for them did not yet exist. ... Darwin also noted, in On the Origin of Species, that a vestigial structure could be useless for its primary function, but still retain secondary ...