vestigial \ ve-STIJ-ee-uhl \ , adjective;
1. Relating to a body part that has become small and lost its use because of evolutionary change.
2. Pertaining to, or of the nature of anything that is no longer present or in existence.
Pixar filmmakers have to be able to tap into their vestigial child, their inner Andy. In that sense, the Toy Story series is their collective autobiography.
— Richard Corliss, “End of Innocence”, Time, June2010.
In gasps he replied that it was a boa – boas were notoriously good-natured – he only wished to see its vestigial hind-legs – then would let it go – he wasnot hurting it.
— Patrick O’Brian, The far side of the world
Vestigial is from the French vestige, “a mark, trace,sign,” which comes from the Latin vestigium, “footprint, trace,” of unknown origin.